Move assembly code to C by using intwrap. It increases core size
by 88 bytes but improves compatibility and maintainability. * grub-core/kern/i386/pc/startup.S (grub_console_putchar): Moved to ... * grub-core/term/i386/pc/console.c (grub_console_putchar_real): ... here. Translated to C. * grub-core/kern/i386/pc/startup.S (grub_console_getkey): Moved to ... * grub-core/term/i386/pc/console.c (grub_console_getkey): ... here. Translated to C. * grub-core/kern/i386/pc/startup.S (grub_console_getxy): Moved to ... * grub-core/term/i386/pc/console.c (grub_console_getxy): ... here. Translated to C. * grub-core/kern/i386/pc/startup.S (grub_console_gotoxy): Moved to ... * grub-core/term/i386/pc/console.c (grub_console_gotoxy): ... here. Translated to C. * grub-core/kern/i386/pc/startup.S (grub_console_cls): Moved to ... * grub-core/term/i386/pc/console.c (grub_console_cls): ... here. Translated to C. * grub-core/kern/i386/pc/startup.S (grub_console_setcursor): Moved to .. * grub-core/term/i386/pc/console.c (grub_console_setcursor): ... here. Translated to C. * grub-core/kern/i386/pc/startup.S (grub_get_rtc): Moved to .. * grub-core/kern/i386/pc/init.c (grub_get_rtc): ... here. Translated to C. * grub-core/term/i386/pc/console.c (int10_9): New function. (grub_console_putchar): Likewise. * include/grub/i386/pc/console.h: Removed the not anymore shared functions.
This commit is contained in:
Vladimir 'phcoder' Serbinenko
parent
678f4b6713
commit
2b23074a0c
5 changed files with 266 additions and 375 deletions
31
ChangeLog
31
ChangeLog
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@ -1,3 +1,34 @@
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2011-11-12 Vladimir Serbinenko <phcoder@gmail.com>
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Move assembly code to C by using intwrap. It increases core size
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by 88 bytes but improves compatibility and maintainability.
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* grub-core/kern/i386/pc/startup.S (grub_console_putchar): Moved to ...
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* grub-core/term/i386/pc/console.c (grub_console_putchar_real):
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... here. Translated to C.
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* grub-core/kern/i386/pc/startup.S (grub_console_getkey): Moved to ...
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* grub-core/term/i386/pc/console.c (grub_console_getkey):
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... here. Translated to C.
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* grub-core/kern/i386/pc/startup.S (grub_console_getxy): Moved to ...
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* grub-core/term/i386/pc/console.c (grub_console_getxy):
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... here. Translated to C.
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* grub-core/kern/i386/pc/startup.S (grub_console_gotoxy): Moved to ...
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* grub-core/term/i386/pc/console.c (grub_console_gotoxy):
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... here. Translated to C.
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* grub-core/kern/i386/pc/startup.S (grub_console_cls): Moved to ...
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* grub-core/term/i386/pc/console.c (grub_console_cls):
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... here. Translated to C.
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* grub-core/kern/i386/pc/startup.S (grub_console_setcursor): Moved to ..
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* grub-core/term/i386/pc/console.c (grub_console_setcursor):
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... here. Translated to C.
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* grub-core/kern/i386/pc/startup.S (grub_get_rtc): Moved to ..
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* grub-core/kern/i386/pc/init.c (grub_get_rtc): ... here.
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Translated to C.
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* grub-core/term/i386/pc/console.c (int10_9): New function.
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(grub_console_putchar): Likewise.
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* include/grub/i386/pc/console.h: Removed the not anymore shared
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functions.
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2011-11-12 Vladimir Serbinenko <phcoder@gmail.com>
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Move grub_chainloader_real_boot out of the kernel.
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@ -47,6 +47,22 @@ static int num_regions;
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void (*grub_pc_net_config) (char **device, char **path);
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/*
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* return the real time in ticks, of which there are about
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* 18-20 per second
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*/
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grub_uint32_t
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grub_get_rtc (void)
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{
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struct grub_bios_int_registers regs;
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regs.eax = 0;
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regs.flags = GRUB_CPU_INT_FLAGS_DEFAULT;
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grub_bios_interrupt (0x1a, ®s);
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return (regs.ecx << 16) | (regs.edx & 0xffff);
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}
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void
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grub_machine_get_bootlocation (char **device, char **path)
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{
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@ -464,371 +464,6 @@ FUNCTION(grub_exit)
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ljmp $0xf000, $0xfff0
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.code32
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/*
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* void grub_console_putchar (int c)
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*
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* Put the character C on the console. Because GRUB wants to write a
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* character with an attribute, this implementation is a bit tricky.
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* If C is a control character (CR, LF, BEL, BS), use INT 10, AH = 0Eh
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* (TELETYPE OUTPUT). Otherwise, save the original position, put a space,
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* save the current position, restore the original position, write the
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* character and the attribute, and restore the current position.
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*
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* The reason why this is so complicated is that there is no easy way to
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* get the height of the screen, and the TELETYPE OUTPUT BIOS call doesn't
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* support setting a background attribute.
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*/
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FUNCTION(grub_console_putchar)
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/* Retrieve the base character. */
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movl 0(%edx), %edx
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pusha
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movb EXT_C(grub_console_cur_color), %bl
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call prot_to_real
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.code16
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movb %dl, %al
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xorb %bh, %bh
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/* use teletype output if control character */
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cmpb $0x7, %al
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je 1f
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cmpb $0x8, %al
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je 1f
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cmpb $0xa, %al
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je 1f
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cmpb $0xd, %al
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je 1f
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/* save the character and the attribute on the stack */
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pushw %ax
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pushw %bx
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/* get the current position */
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movb $0x3, %ah
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int $0x10
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/* check the column with the width */
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cmpb $79, %dl
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jl 2f
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/* print CR and LF, if next write will exceed the width */
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movw $0x0e0d, %ax
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int $0x10
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movb $0x0a, %al
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int $0x10
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/* get the current position */
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movb $0x3, %ah
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int $0x10
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2:
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/* restore the character and the attribute */
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popw %bx
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popw %ax
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/* write the character with the attribute */
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movb $0x9, %ah
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movw $1, %cx
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int $0x10
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/* move the cursor forward */
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incb %dl
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movb $0x2, %ah
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int $0x10
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jmp 3f
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1: movw $1, %bx
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movb $0xe, %ah
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int $0x10
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3: DATA32 call real_to_prot
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.code32
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popa
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ret
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LOCAL(bypass_table):
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.word 0x011b, 0x0f00 | '\t', 0x0e00 | '\b', 0x1c00 | '\r'
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.word 0x1c00 | '\n'
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LOCAL(bypass_table_end):
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/*
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* int grub_console_getkey (void)
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* if there is a character pending, return it; otherwise return -1
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* BIOS call "INT 16H Function 01H" to check whether a character is pending
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* Call with %ah = 0x1
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* Return:
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* If key waiting to be input:
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* %ah = keyboard scan code
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* %al = ASCII character
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* Zero flag = clear
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* else
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* Zero flag = set
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* BIOS call "INT 16H Function 00H" to read character from keyboard
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* Call with %ah = 0x0
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* Return: %ah = keyboard scan code
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* %al = ASCII character
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*/
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FUNCTION(grub_console_getkey)
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pushl %ebp
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pushl %edi
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call prot_to_real
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.code16
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/*
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* Due to a bug in apple's bootcamp implementation, INT 16/AH = 0 would
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* cause the machine to hang at the second keystroke. However, we can
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* work around this problem by ensuring the presence of keystroke with
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* INT 16/AH = 1 before calling INT 16/AH = 0.
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*/
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movb $1, %ah
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int $0x16
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jz notpending
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movb $0, %ah
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int $0x16
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xorl %edx, %edx
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movw %ax, %dx /* real_to_prot uses %eax */
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DATA32 call real_to_prot
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.code32
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movl $0xff, %eax
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testl %eax, %edx
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jz 1f
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andl %edx, %eax
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cmpl $0x20, %eax
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jae 2f
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movl %edx, %eax
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leal LOCAL(bypass_table), %edi
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movl $((LOCAL(bypass_table_end) - LOCAL(bypass_table)) >> 1), %ecx
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repne scasw
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jz 3f
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andl $0xff, %eax
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addl $(('a' - 1) | GRUB_TERM_CTRL), %eax
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jmp 2f
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3:
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andl $0xff, %eax
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jmp 2f
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1: movl %edx, %eax
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shrl $8, %eax
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orl $GRUB_TERM_EXTENDED, %eax
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2:
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popl %edi
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popl %ebp
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ret
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notpending:
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.code16
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DATA32 call real_to_prot
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.code32
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#if GRUB_TERM_NO_KEY != 0
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#error Fix this asm code
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#endif
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jmp 2b
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/*
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* grub_uint16_t grub_console_getxy (void)
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* BIOS call "INT 10H Function 03h" to get cursor position
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* Call with %ah = 0x03
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* %bh = page
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* Returns %ch = starting scan line
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* %cl = ending scan line
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* %dh = row (0 is top)
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* %dl = column (0 is left)
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*/
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FUNCTION(grub_console_getxy)
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pushl %ebp
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pushl %ebx /* save EBX */
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call prot_to_real
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.code16
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xorb %bh, %bh /* set page to 0 */
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movb $0x3, %ah
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int $0x10 /* get cursor position */
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DATA32 call real_to_prot
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.code32
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movb %dl, %ah
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movb %dh, %al
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popl %ebx
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popl %ebp
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ret
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/*
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* void grub_console_gotoxy(grub_uint8_t x, grub_uint8_t y)
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* BIOS call "INT 10H Function 02h" to set cursor position
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* Call with %ah = 0x02
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* %bh = page
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* %dh = row (0 is top)
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* %dl = column (0 is left)
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*/
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FUNCTION(grub_console_gotoxy)
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pushl %ebp
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pushl %ebx /* save EBX */
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movb %cl, %dh /* %dh = y */
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/* %dl = x */
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call prot_to_real
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.code16
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xorb %bh, %bh /* set page to 0 */
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movb $0x2, %ah
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int $0x10 /* set cursor position */
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DATA32 call real_to_prot
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.code32
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popl %ebx
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popl %ebp
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ret
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/*
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* void grub_console_cls (void)
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* BIOS call "INT 10H Function 09h" to write character and attribute
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* Call with %ah = 0x09
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* %al = (character)
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* %bh = (page number)
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* %bl = (attribute)
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* %cx = (number of times)
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*/
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FUNCTION(grub_console_cls)
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pushl %ebp
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pushl %ebx /* save EBX */
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call prot_to_real
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.code16
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/* move the cursor to the beginning */
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movb $0x02, %ah
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xorb %bh, %bh
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xorw %dx, %dx
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int $0x10
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/* write spaces to the entire screen */
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movw $0x0920, %ax
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movw $0x07, %bx
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movw $(80 * 25), %cx
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int $0x10
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/* move back the cursor */
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movb $0x02, %ah
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int $0x10
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DATA32 call real_to_prot
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.code32
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popl %ebx
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popl %ebp
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ret
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/*
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* void grub_console_setcursor (int on)
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* BIOS call "INT 10H Function 01h" to set cursor type
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* Call with %ah = 0x01
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* %ch = cursor starting scanline
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* %cl = cursor ending scanline
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*/
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console_cursor_state:
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.byte 1
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console_cursor_shape:
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.word 0
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FUNCTION(grub_console_setcursor)
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pushl %ebp
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pushl %ebx
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/* push ON */
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pushl %edx
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/* check if the standard cursor shape has already been saved */
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movw console_cursor_shape, %ax
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testw %ax, %ax
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jne 1f
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call prot_to_real
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.code16
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movb $0x03, %ah
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xorb %bh, %bh
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int $0x10
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DATA32 call real_to_prot
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.code32
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cmp %cl, %ch
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jb 3f
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movw $0x0d0e, %cx
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3:
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movw %cx, console_cursor_shape
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1:
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/* set %cx to the designated cursor shape */
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movw $0x2000, %cx
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popl %eax
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testl %eax, %eax
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jz 2f
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movw console_cursor_shape, %cx
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2:
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call prot_to_real
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.code16
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movb $0x1, %ah
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int $0x10
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DATA32 call real_to_prot
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.code32
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popl %ebx
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popl %ebp
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||||
ret
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||||
|
||||
/*
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||||
* grub_get_rtc()
|
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* return the real time in ticks, of which there are about
|
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* 18-20 per second
|
||||
*/
|
||||
FUNCTION(grub_get_rtc)
|
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pushl %ebp
|
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|
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call prot_to_real /* enter real mode */
|
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.code16
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|
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/* %ax is already zero */
|
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int $0x1a
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|
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DATA32 call real_to_prot
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.code32
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|
||||
movl %ecx, %eax
|
||||
shll $16, %eax
|
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movw %dx, %ax
|
||||
|
||||
popl %ebp
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||||
ret
|
||||
|
||||
/*
|
||||
* int grub_pxe_call (int func, void* data, grub_uint32_t pxe_rm_entry);
|
||||
*/
|
||||
|
|
|
|||
|
|
@ -20,6 +20,225 @@
|
|||
#include <grub/machine/console.h>
|
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#include <grub/term.h>
|
||||
#include <grub/types.h>
|
||||
#include <grub/machine/int.h>
|
||||
|
||||
static void
|
||||
int10_9 (grub_uint8_t ch, grub_uint16_t n)
|
||||
{
|
||||
struct grub_bios_int_registers regs;
|
||||
|
||||
regs.eax = ch | 0x0900;
|
||||
regs.ebx = grub_console_cur_color & 0xff;
|
||||
regs.ecx = n;
|
||||
regs.flags = GRUB_CPU_INT_FLAGS_DEFAULT;
|
||||
grub_bios_interrupt (0x10, ®s);
|
||||
}
|
||||
|
||||
/*
|
||||
* BIOS call "INT 10H Function 03h" to get cursor position
|
||||
* Call with %ah = 0x03
|
||||
* %bh = page
|
||||
* Returns %ch = starting scan line
|
||||
* %cl = ending scan line
|
||||
* %dh = row (0 is top)
|
||||
* %dl = column (0 is left)
|
||||
*/
|
||||
|
||||
|
||||
static grub_uint16_t
|
||||
grub_console_getxy (struct grub_term_output *term __attribute__ ((unused)))
|
||||
{
|
||||
struct grub_bios_int_registers regs;
|
||||
|
||||
regs.eax = 0x0300;
|
||||
regs.ebx = 0;
|
||||
regs.flags = GRUB_CPU_INT_FLAGS_DEFAULT;
|
||||
grub_bios_interrupt (0x10, ®s);
|
||||
|
||||
return ((regs.edx & 0xff) << 8) | ((regs.edx & 0xff00) >> 8);
|
||||
}
|
||||
|
||||
/*
|
||||
* BIOS call "INT 10H Function 02h" to set cursor position
|
||||
* Call with %ah = 0x02
|
||||
* %bh = page
|
||||
* %dh = row (0 is top)
|
||||
* %dl = column (0 is left)
|
||||
*/
|
||||
static void
|
||||
grub_console_gotoxy (struct grub_term_output *term __attribute__ ((unused)),
|
||||
grub_uint8_t x, grub_uint8_t y)
|
||||
{
|
||||
struct grub_bios_int_registers regs;
|
||||
|
||||
/* set page to 0 */
|
||||
regs.ebx = 0;
|
||||
regs.eax = 0x0200;
|
||||
regs.edx = (y << 8) | x;
|
||||
regs.flags = GRUB_CPU_INT_FLAGS_DEFAULT;
|
||||
grub_bios_interrupt (0x10, ®s);
|
||||
}
|
||||
|
||||
/*
|
||||
*
|
||||
* Put the character C on the console. Because GRUB wants to write a
|
||||
* character with an attribute, this implementation is a bit tricky.
|
||||
* If C is a control character (CR, LF, BEL, BS), use INT 10, AH = 0Eh
|
||||
* (TELETYPE OUTPUT). Otherwise, save the original position, put a space,
|
||||
* save the current position, restore the original position, write the
|
||||
* character and the attribute, and restore the current position.
|
||||
*
|
||||
* The reason why this is so complicated is that there is no easy way to
|
||||
* get the height of the screen, and the TELETYPE OUTPUT BIOS call doesn't
|
||||
* support setting a background attribute.
|
||||
*/
|
||||
static void
|
||||
grub_console_putchar_real (grub_uint8_t c)
|
||||
{
|
||||
struct grub_bios_int_registers regs;
|
||||
grub_uint16_t pos;
|
||||
|
||||
if (c == 7 || c == 8 || c == 0xa || c == 0xd)
|
||||
{
|
||||
regs.eax = c | 0x0e00;
|
||||
regs.ebx = 0x0001;
|
||||
regs.flags = GRUB_CPU_INT_FLAGS_DEFAULT;
|
||||
grub_bios_interrupt (0x10, ®s);
|
||||
return;
|
||||
}
|
||||
|
||||
/* get the current position */
|
||||
pos = grub_console_getxy (NULL);
|
||||
|
||||
/* check the column with the width */
|
||||
if ((pos & 0xff00) >= (79 << 8))
|
||||
{
|
||||
grub_console_putchar_real (0x0d);
|
||||
grub_console_putchar_real (0x0a);
|
||||
/* get the current position */
|
||||
pos = grub_console_getxy (NULL);
|
||||
}
|
||||
|
||||
/* write the character with the attribute */
|
||||
int10_9 (c, 1);
|
||||
|
||||
grub_console_gotoxy (NULL, ((pos & 0xff00) >> 8) + 1, (pos & 0xff));
|
||||
}
|
||||
|
||||
static void
|
||||
grub_console_putchar (struct grub_term_output *term __attribute__ ((unused)),
|
||||
const struct grub_unicode_glyph *c)
|
||||
{
|
||||
grub_console_putchar_real (c->base);
|
||||
}
|
||||
|
||||
/*
|
||||
* BIOS call "INT 10H Function 09h" to write character and attribute
|
||||
* Call with %ah = 0x09
|
||||
* %al = (character)
|
||||
* %bh = (page number)
|
||||
* %bl = (attribute)
|
||||
* %cx = (number of times)
|
||||
*/
|
||||
static void
|
||||
grub_console_cls (struct grub_term_output *term)
|
||||
{
|
||||
/* move the cursor to the beginning */
|
||||
grub_console_gotoxy (term, 0, 0);
|
||||
|
||||
/* write spaces to the entire screen */
|
||||
int10_9 (' ', 80 * 25);
|
||||
|
||||
/* move back the cursor */
|
||||
grub_console_gotoxy (term, 0, 0);
|
||||
}
|
||||
|
||||
/*
|
||||
* void grub_console_setcursor (int on)
|
||||
* BIOS call "INT 10H Function 01h" to set cursor type
|
||||
* Call with %ah = 0x01
|
||||
* %ch = cursor starting scanline
|
||||
* %cl = cursor ending scanline
|
||||
*/
|
||||
static void
|
||||
grub_console_setcursor (struct grub_term_output *term __attribute__ ((unused)),
|
||||
int on)
|
||||
{
|
||||
static grub_uint16_t console_cursor_shape = 0;
|
||||
struct grub_bios_int_registers regs;
|
||||
|
||||
/* check if the standard cursor shape has already been saved */
|
||||
if (!console_cursor_shape)
|
||||
{
|
||||
regs.eax = 0x0300;
|
||||
regs.ebx = 0;
|
||||
regs.flags = GRUB_CPU_INT_FLAGS_DEFAULT;
|
||||
grub_bios_interrupt (0x10, ®s);
|
||||
console_cursor_shape = regs.ecx;
|
||||
if ((console_cursor_shape >> 8) >= (console_cursor_shape & 0xff))
|
||||
console_cursor_shape = 0x0d0e;
|
||||
}
|
||||
/* set %cx to the designated cursor shape */
|
||||
regs.ecx = on ? console_cursor_shape : 0x2000;
|
||||
regs.eax = 0x0100;
|
||||
regs.flags = GRUB_CPU_INT_FLAGS_DEFAULT;
|
||||
grub_bios_interrupt (0x10, ®s);
|
||||
}
|
||||
|
||||
/*
|
||||
* if there is a character pending, return it; otherwise return -1
|
||||
* BIOS call "INT 16H Function 01H" to check whether a character is pending
|
||||
* Call with %ah = 0x1
|
||||
* Return:
|
||||
* If key waiting to be input:
|
||||
* %ah = keyboard scan code
|
||||
* %al = ASCII character
|
||||
* Zero flag = clear
|
||||
* else
|
||||
* Zero flag = set
|
||||
* BIOS call "INT 16H Function 00H" to read character from keyboard
|
||||
* Call with %ah = 0x0
|
||||
* Return: %ah = keyboard scan code
|
||||
* %al = ASCII character
|
||||
*/
|
||||
|
||||
static int
|
||||
grub_console_getkey (struct grub_term_input *term __attribute__ ((unused)))
|
||||
{
|
||||
const grub_uint16_t bypass_table[] = {
|
||||
0x0100 | '\e', 0x0f00 | '\t', 0x0e00 | '\b', 0x1c00 | '\r', 0x1c00 | '\n'
|
||||
};
|
||||
struct grub_bios_int_registers regs;
|
||||
unsigned i;
|
||||
|
||||
/*
|
||||
* Due to a bug in apple's bootcamp implementation, INT 16/AH = 0 would
|
||||
* cause the machine to hang at the second keystroke. However, we can
|
||||
* work around this problem by ensuring the presence of keystroke with
|
||||
* INT 16/AH = 1 before calling INT 16/AH = 0.
|
||||
*/
|
||||
|
||||
regs.eax = 0x0100;
|
||||
regs.flags = GRUB_CPU_INT_FLAGS_DEFAULT;
|
||||
grub_bios_interrupt (0x16, ®s);
|
||||
if (regs.flags & GRUB_CPU_INT_FLAGS_ZERO)
|
||||
return GRUB_TERM_NO_KEY;
|
||||
|
||||
regs.eax = 0x0000;
|
||||
regs.flags = GRUB_CPU_INT_FLAGS_DEFAULT;
|
||||
grub_bios_interrupt (0x16, ®s);
|
||||
if (!(regs.eax & 0xff))
|
||||
return ((regs.eax >> 8) & 0xff) | GRUB_TERM_EXTENDED;
|
||||
|
||||
if ((regs.eax & 0xff) >= ' ')
|
||||
return regs.eax & 0xff;
|
||||
|
||||
for (i = 0; i < ARRAY_SIZE (bypass_table); i++)
|
||||
if (bypass_table[i] == (regs.eax & 0xffff))
|
||||
return regs.eax & 0xff;
|
||||
|
||||
return (regs.eax & 0xff) + (('a' - 1) | GRUB_TERM_CTRL);
|
||||
}
|
||||
|
||||
static const struct grub_machine_bios_data_area *bios_data_area =
|
||||
(struct grub_machine_bios_data_area *) GRUB_MEMORY_MACHINE_BIOS_DATA_AREA_ADDR;
|
||||
|
|
|
|||
|
|
@ -26,16 +26,6 @@
|
|||
#include <grub/term.h>
|
||||
#include <grub/i386/vga_common.h>
|
||||
|
||||
/* These are global to share code between C and asm. */
|
||||
int grub_console_getkey (struct grub_term_input *term);
|
||||
grub_uint16_t grub_console_getxy (struct grub_term_output *term);
|
||||
void grub_console_gotoxy (struct grub_term_output *term,
|
||||
grub_uint8_t x, grub_uint8_t y);
|
||||
void grub_console_cls (struct grub_term_output *term);
|
||||
void grub_console_setcursor (struct grub_term_output *term, int on);
|
||||
void grub_console_putchar (struct grub_term_output *term,
|
||||
const struct grub_unicode_glyph *c);
|
||||
|
||||
/* Initialize the console system. */
|
||||
void grub_console_init (void);
|
||||
|
||||
|
|
|
|||
Loading…
Reference in a new issue