diff --git a/conf/i386-pc.rmk b/conf/i386-pc.rmk index 84e6f1b1e..bef17a25b 100644 --- a/conf/i386-pc.rmk +++ b/conf/i386-pc.rmk @@ -54,8 +54,8 @@ kernel_img_SOURCES = kern/i386/pc/startup.S \ kern/env.c \ term/i386/pc/console.c term/i386/vga_common.c \ symlist.c -kernel_img_HEADERS += machine/biosdisk.h machine/vga.h machine/vbe.h \ - machine/pxe.h i386/pit.h machine/init.h machine/int.h +kernel_img_HEADERS += machine/biosdisk.h machine/pxe.h i386/pit.h \ + machine/init.h machine/int.h kernel_img_CFLAGS = $(COMMON_CFLAGS) $(TARGET_IMG_CFLAGS) kernel_img_ASFLAGS = $(COMMON_ASFLAGS) kernel_img_LDFLAGS = $(COMMON_LDFLAGS) $(TARGET_IMG_LDFLAGS)$(GRUB_KERNEL_MACHINE_LINK_ADDR) $(COMMON_CFLAGS) diff --git a/include/grub/i386/pc/vbe.h b/include/grub/i386/pc/vbe.h index abf246fa1..9b05c2299 100644 --- a/include/grub/i386/pc/vbe.h +++ b/include/grub/i386/pc/vbe.h @@ -169,56 +169,40 @@ struct grub_vbe_palette_data grub_uint8_t alignment; } __attribute__ ((packed)); -/* Prototypes for kernel real mode thunks. */ - +/* Prototypes for helper functions. */ /* Call VESA BIOS 0x4f00 to get VBE Controller Information, return status. */ -grub_vbe_status_t EXPORT_FUNC(grub_vbe_bios_get_controller_info) (struct grub_vbe_info_block *controller_info); - +grub_vbe_status_t +grub_vbe_bios_get_controller_info (struct grub_vbe_info_block *controller_info); /* Call VESA BIOS 0x4f01 to get VBE Mode Information, return status. */ -grub_vbe_status_t EXPORT_FUNC(grub_vbe_bios_get_mode_info) (grub_uint32_t mode, - struct grub_vbe_mode_info_block *mode_info); +grub_vbe_status_t +grub_vbe_bios_get_mode_info (grub_uint32_t mode, + struct grub_vbe_mode_info_block *mode_info); +/* Call VESA BIOS 0x4f03 to return current VBE Mode, return status. */ +grub_vbe_status_t +grub_vbe_bios_get_mode (grub_uint32_t *mode); +/* Call VESA BIOS 0x4f05 to set memory window, return status. */ +grub_vbe_status_t +grub_vbe_bios_set_memory_window (grub_uint32_t window, grub_uint32_t position); +/* Call VESA BIOS 0x4f05 to return memory window, return status. */ +grub_vbe_status_t +grub_vbe_bios_get_memory_window (grub_uint32_t window, + grub_uint32_t *position); +/* Call VESA BIOS 0x4f06 to set scanline length (in bytes), return status. */ +grub_vbe_status_t +grub_vbe_bios_set_scanline_length (grub_uint32_t length); +/* Call VESA BIOS 0x4f06 to return scanline length (in bytes), return status. */ +grub_vbe_status_t +grub_vbe_bios_get_scanline_length (grub_uint32_t *length); +/* Call VESA BIOS 0x4f07 to get display start, return status. */ +grub_vbe_status_t +grub_vbe_bios_get_display_start (grub_uint32_t *x, + grub_uint32_t *y); -grub_vbe_status_t EXPORT_FUNC(grub_vbe_bios_getset_dac_palette_width) (int set, int *width); +grub_vbe_status_t grub_vbe_bios_getset_dac_palette_width (int set, int *width); #define grub_vbe_bios_get_dac_palette_width(width) grub_vbe_bios_getset_dac_palette_width(0, (width)) #define grub_vbe_bios_set_dac_palette_width(width) grub_vbe_bios_getset_dac_palette_width(1, (width)) -/* Call VESA BIOS 0x4f02 to set video mode, return status. */ -grub_vbe_status_t EXPORT_FUNC(grub_vbe_bios_set_mode) (grub_uint32_t mode, - struct grub_vbe_crtc_info_block *crtc_info); - -/* Call VESA BIOS 0x4f03 to return current VBE Mode, return status. */ -grub_vbe_status_t EXPORT_FUNC(grub_vbe_bios_get_mode) (grub_uint32_t *mode); - -/* Call VESA BIOS 0x4f05 to set memory window, return status. */ -grub_vbe_status_t EXPORT_FUNC(grub_vbe_bios_set_memory_window) (grub_uint32_t window, - grub_uint32_t position); - -/* Call VESA BIOS 0x4f05 to return memory window, return status. */ -grub_vbe_status_t EXPORT_FUNC(grub_vbe_bios_get_memory_window) (grub_uint32_t window, - grub_uint32_t *position); - -/* Call VESA BIOS 0x4f06 to set scanline length (in bytes), return status. */ -grub_vbe_status_t EXPORT_FUNC(grub_vbe_bios_set_scanline_length) (grub_uint32_t length); - -/* Call VESA BIOS 0x4f06 to return scanline length (in bytes), return status. */ -grub_vbe_status_t EXPORT_FUNC(grub_vbe_bios_get_scanline_length) (grub_uint32_t *length); - -/* Call VESA BIOS 0x4f07 to set display start, return status. */ -grub_vbe_status_t EXPORT_FUNC(grub_vbe_bios_set_display_start) (grub_uint32_t x, - grub_uint32_t y); - -/* Call VESA BIOS 0x4f07 to get display start, return status. */ -grub_vbe_status_t EXPORT_FUNC(grub_vbe_bios_get_display_start) (grub_uint32_t *x, - grub_uint32_t *y); - -/* Call VESA BIOS 0x4f09 to set palette data, return status. */ -grub_vbe_status_t EXPORT_FUNC(grub_vbe_bios_set_palette_data) (grub_uint32_t color_count, - grub_uint32_t start_index, - struct grub_vbe_palette_data *palette_data); - -/* Prototypes for helper functions. */ - grub_err_t grub_vbe_probe (struct grub_vbe_info_block *info_block); grub_err_t grub_vbe_set_video_mode (grub_uint32_t mode, struct grub_vbe_mode_info_block *mode_info); diff --git a/include/grub/i386/pc/vga.h b/include/grub/i386/pc/vga.h index 2724f6401..ecc169022 100644 --- a/include/grub/i386/pc/vga.h +++ b/include/grub/i386/pc/vga.h @@ -25,7 +25,4 @@ /* The VGA (at the beginning of upper memory). */ #define GRUB_MEMORY_MACHINE_VGA_ADDR GRUB_MEMORY_MACHINE_UPPER -/* Set the video mode to MODE and return the previous mode. */ -unsigned char EXPORT_FUNC(grub_vga_set_mode) (unsigned char mode); - #endif /* ! GRUB_VGA_MACHINE_HEADER */ diff --git a/kern/i386/pc/startup.S b/kern/i386/pc/startup.S index a9e819a9f..8e4bd13bd 100644 --- a/kern/i386/pc/startup.S +++ b/kern/i386/pc/startup.S @@ -1434,513 +1434,6 @@ FUNCTION(grub_get_rtc) popl %ebp ret - -/* - * unsigned char grub_vga_set_mode (unsigned char mode) - */ -FUNCTION(grub_vga_set_mode) - pushl %ebp - pushl %ebx - movl %eax, %ecx - - call prot_to_real - .code16 - /* get current mode */ - xorw %bx, %bx - movb $0x0f, %ah - int $0x10 - movb %al, %dl - - /* set the new mode */ - movb %cl, %al - xorb %ah, %ah - int $0x10 - - DATA32 call real_to_prot - .code32 - - movb %dl, %al - popl %ebx - popl %ebp - ret - -/* - * grub_vbe_bios_status_t grub_vbe_get_controller_info (struct grub_vbe_info_block *controller_info) - * - * Register allocations for parameters: - * %eax *controller_info - */ -FUNCTION(grub_vbe_bios_get_controller_info) - pushl %ebp - pushl %edi - pushl %edx - - movw %ax, %di /* Store *controller_info to %edx:%di. */ - xorw %ax, %ax - shrl $4, %eax - mov %eax, %edx /* prot_to_real destroys %eax. */ - - call prot_to_real - .code16 - - pushw %es - - movw %dx, %es /* *controller_info is now on %es:%di. */ - movw $0x4f00, %ax - int $0x10 - - movw %ax, %dx /* real_to_prot destroys %eax. */ - - popw %es - - DATA32 call real_to_prot - .code32 - - movl %edx, %eax - andl $0x0FFFF, %eax /* Return value in %eax. */ - - pop %edx - popl %edi - popl %ebp - ret - -/* - * grub_vbe_status_t grub_vbe_bios_get_mode_info (grub_uint32_t mode, - * struct grub_vbe_mode_info_block *mode_info) - * - * Register allocations for parameters: - * %eax mode - * %edx *mode_info - */ -FUNCTION(grub_vbe_bios_get_mode_info) - pushl %ebp - pushl %edi - - movl %eax, %ecx /* Store mode number to %ecx. */ - - movw %dx, %di /* Store *mode_info to %edx:%di. */ - xorw %dx, %dx - shrl $4, %edx - - call prot_to_real - .code16 - - pushw %es - - movw %dx, %es /* *mode_info is now on %es:%di. */ - movw $0x4f01, %ax - int $0x10 - - movw %ax, %dx /* real_to_prot destroys %eax. */ - - popw %es - - DATA32 call real_to_prot - .code32 - - movl %edx, %eax - andl $0x0FFFF, %eax /* Return value in %eax. */ - - popl %edi - popl %ebp - ret - -/* - * grub_vbe_status_t grub_vbe_bios_set_mode (grub_uint32_t mode, - * struct grub_vbe_crtc_info_block *crtc_info) - * - * Register allocations for parameters: - * %eax mode - * %edx *crtc_info - */ -FUNCTION(grub_vbe_bios_set_mode) - pushl %ebp - pushl %ebx - pushl %edi - - movl %eax, %ebx /* Store mode in %ebx. */ - - movw %dx, %di /* Store *crtc_info to %edx:%di. */ - xorw %dx, %dx - shrl $4, %edx - - call prot_to_real - .code16 - - pushw %es - - movw %dx, %es /* *crtc_info is now on %es:%di. */ - - movw $0x4f02, %ax - int $0x10 - - movw %ax, %dx /* real_to_prot destroys %eax. */ - - popw %es - - DATA32 call real_to_prot - .code32 - - movw %dx, %ax - andl $0xFFFF, %eax /* Return value in %eax. */ - - popl %edi - popl %ebx - popl %ebp - ret - -/* - * grub_vbe_status_t grub_vbe_bios_get_mode (grub_uint32_t *mode) - * - * Register allocations for parameters: - * %eax *mode - */ -FUNCTION(grub_vbe_bios_get_mode) - pushl %ebp - pushl %ebx - pushl %edi - pushl %edx - pushl %eax /* Push *mode to stack. */ - - call prot_to_real - .code16 - - movw $0x4f03, %ax - int $0x10 - - movw %ax, %dx /* real_to_prot destroys %eax. */ - - DATA32 call real_to_prot - .code32 - - popl %edi /* Pops *mode from stack to %edi. */ - andl $0xFFFF, %ebx - movl %ebx, (%edi) - - movw %dx, %ax - andl $0xFFFF, %eax /* Return value in %eax. */ - - popl %edx - popl %edi - popl %ebx - popl %ebp - ret - -/* - * grub_vbe_status_t grub_vbe_bios_getset_dac_palette_width (int set, int *dac_mask_size) - * - * Register allocations for parameters: - * %eax set - * %edx *dac_mask_size - */ -FUNCTION(grub_vbe_bios_getset_dac_palette_width) - pushl %ebp - pushl %ebx - - xorl %ebx, %ebx - - /* If we only want to fetch the value, set %bl to 1. */ - testl %eax, %eax - jne 1f - incb %bl -1: - - /* Put desired width in %bh. */ - movl (%edx), %eax - movb %al, %bh - - call prot_to_real - .code16 - - movw $0x4f08, %ax - int $0x10 - - movw %ax, %cx /* real_to_prot destroys %eax. */ - - DATA32 call real_to_prot - .code32 - - /* Move result back to *dac_mask_size. */ - xorl %eax, %eax - movb %bh, %al - movl %eax, (%edx) - - /* Return value in %eax. */ - movw %cx, %ax - - popl %ebx - popl %ebp - ret - -/* - * grub_vbe_status_t grub_vbe_bios_set_memory_window (grub_uint32_t window, - * grub_uint32_t position); - * - * Register allocations for parameters: - * %eax window - * %edx position - */ -FUNCTION(grub_vbe_bios_set_memory_window) - pushl %ebp - pushl %ebx - - movl %eax, %ebx - - call prot_to_real - .code16 - - movw $0x4f05, %ax - andw $0x00ff, %bx /* BL = window, BH = 0, Set memory window. */ - int $0x10 - - movw %ax, %dx /* real_to_prot destroys %eax. */ - - DATA32 call real_to_prot - .code32 - - movw %dx, %ax - andl $0xFFFF, %eax /* Return value in %eax. */ - - popl %ebx - popl %ebp - ret - -/* - * grub_vbe_status_t grub_vbe_bios_get_memory_window (grub_uint32_t window, - * grub_uint32_t *position); - * - * Register allocations for parameters: - * %eax window - * %edx *position - */ -FUNCTION(grub_vbe_bios_get_memory_window) - pushl %ebp - pushl %ebx - pushl %edi - pushl %edx /* Push *position to stack. */ - - movl %eax, %ebx /* Store window in %ebx. */ - - call prot_to_real - .code16 - - movw $0x4f05, %ax - andw $0x00ff, %bx /* BL = window. */ - orw $0x0100, %bx /* BH = 1, Get memory window. */ - int $0x10 - - movw %ax, %bx /* real_to_prot destroys %eax. */ - - DATA32 call real_to_prot - .code32 - - popl %edi /* pops *position from stack to %edi. */ - andl $0xFFFF, %edx - movl %edx, (%edi) /* Return position to caller. */ - - movw %bx, %ax - andl $0xFFFF, %eax /* Return value in %eax. */ - - popl %edi - popl %ebx - popl %ebp - ret - -/* - * grub_vbe_status_t grub_vbe_bios_set_scanline_length (grub_uint32_t length) - * - * Register allocations for parameters: - * %eax length - */ -FUNCTION(grub_vbe_bios_set_scanline_length) - pushl %ebp - pushl %ebx - pushl %edx - - movl %eax, %ecx /* Store length in %ecx. */ - - call prot_to_real - .code16 - - movw $0x4f06, %ax - movw $0x0002, %bx /* BL = 2, Set Scan Line in Bytes. */ - int $0x10 - - movw %ax, %dx /* real_to_prot destroys %eax. */ - - DATA32 call real_to_prot - .code32 - - movw %dx, %ax - andl $0xFFFF, %eax /* Return value in %eax. */ - - popl %edx - popl %ebx - popl %ebp - ret - -/* - * grub_vbe_status_t grub_vbe_bios_get_scanline_length (grub_uint32_t *length) - * - * Register allocations for parameters: - * %eax *length - */ -FUNCTION(grub_vbe_bios_get_scanline_length) - pushl %ebp - pushl %ebx - pushl %edi - pushl %edx /* Push *length to stack. */ - - call prot_to_real - .code16 - - movw $0x4f06, %ax - movw $0x0001, %bx /* BL = 1, Get Scan Line Length (in bytes). */ - int $0x10 - - movw %ax, %dx /* real_to_prot destroys %eax. */ - - DATA32 call real_to_prot - .code32 - - popl %edi /* Pops *length from stack to %edi. */ - andl $0xFFFF, %ebx - movl %ebx, (%edi) /* Return length to caller. */ - - movw %dx, %ax - andl $0xFFFF, %eax /* Return value in %eax. */ - - popl %edi - popl %ebx - popl %ebp - ret - -/* - * grub_vbe_status_t grub_vbe_bios_set_display_start (grub_uint32_t x, - * grub_uint32_t y) - * - * Register allocations for parameters: - * %eax x - * %edx y - */ -FUNCTION(grub_vbe_bios_set_display_start) - pushl %ebp - pushl %ebx - - movl %eax, %ecx /* Store x in %ecx. */ - - call prot_to_real - .code16 - - movw $0x4f07, %ax - movw $0x0080, %bx /* BL = 80h, Set Display Start - during Vertical Retrace. */ - int $0x10 - - movw %ax, %dx /* real_to_prot destroys %eax. */ - - DATA32 call real_to_prot - .code32 - - movw %dx, %ax - andl $0xFFFF, %eax /* Return value in %eax. */ - - popl %ebx - popl %ebp - ret - -/* - * grub_vbe_status_t grub_vbe_bios_get_display_start (grub_uint32_t *x, - * grub_uint32_t *y) - * - * Register allocations for parameters: - * %eax *x - * %edx *y - */ -FUNCTION(grub_vbe_bios_get_display_start) - pushl %ebp - pushl %ebx - pushl %edi - pushl %eax /* Push *x to stack. */ - pushl %edx /* Push *y to stack. */ - - call prot_to_real - .code16 - - movw $0x4f07, %ax - movw $0x0001, %bx /* BL = 1, Get Display Start. */ - int $0x10 - - movw %ax, %bx /* real_to_prot destroys %eax. */ - - DATA32 call real_to_prot - .code32 - - popl %edi /* Pops *y from stack to %edi. */ - andl $0xFFFF, %edx - movl %edx, (%edi) /* Return y-position to caller. */ - - popl %edi /* Pops *x from stack to %edi. */ - andl $0xFFFF, %ecx - movl %ecx, (%edi) /* Return x-position to caller. */ - - movw %bx, %ax - andl $0xFFFF, %eax /* Return value in %eax. */ - - popl %edi - popl %ebx - popl %ebp - ret - -/* - * grub_vbe_status_t grub_vbe_bios_set_palette_data (grub_uint32_t color_count, - * grub_uint32_t start_index, - * struct grub_vbe_palette_data *palette_data) - * - * Register allocations for parameters: - * %eax color_count - * %edx start_index - * %ecx *palette_data - */ -FUNCTION(grub_vbe_bios_set_palette_data) - pushl %ebp - pushl %ebx - pushl %edi - - movl %eax, %ebx /* Store color_count in %ebx. */ - - movw %cx, %di /* Store *palette_data to %ecx:%di. */ - xorw %cx, %cx - shrl $4, %ecx - - call prot_to_real - .code16 - - pushw %es - - movw %cx, %es /* *palette_data is now on %es:%di. */ - movw %bx, %cx /* color_count is now on %cx. */ - - movw $0x4f09, %ax - xorw %bx, %bx /* BL = 0, Set Palette Data. */ - int $0x10 - - movw %ax, %dx /* real_to_prot destroys %eax. */ - - popw %es - - DATA32 call real_to_prot - .code32 - - movw %dx, %ax - andl $0xFFFF, %eax /* Return value in %eax. */ - - popl %edi - popl %ebx - popl %ebp - ret - - pxe_rm_entry: .long 0 diff --git a/term/i386/pc/vga.c b/term/i386/pc/vga.c index 402b30fe6..85c516b6a 100644 --- a/term/i386/pc/vga.c +++ b/term/i386/pc/vga.c @@ -19,6 +19,7 @@ // TODO: Deprecated and broken. Needs to be converted to Video Driver! #include +#include #include #include #include @@ -82,6 +83,25 @@ static grub_font_t font = 0; #define INPUT_STATUS1_REGISTER 0x3DA #define INPUT_STATUS1_VERTR_BIT 0x08 +static unsigned char +grub_vga_set_mode (unsigned char mode) +{ + struct grub_bios_int_registers regs; + unsigned char ret; + /* get current mode */ + regs.eax = 0x0f00; + regs.ebx = 0; + regs.flags = GRUB_CPU_INT_FLAGS_DEFAULT; + grub_bios_interrupt (0x10, ®s); + + ret = regs.eax & 0xff; + regs.eax = mode; + regs.flags = GRUB_CPU_INT_FLAGS_DEFAULT; + grub_bios_interrupt (0x10, ®s); + + return ret; +} + static inline void wait_vretrace (void) { diff --git a/video/i386/pc/vbe.c b/video/i386/pc/vbe.c index 72b8f1831..45ba86227 100644 --- a/video/i386/pc/vbe.c +++ b/video/i386/pc/vbe.c @@ -28,6 +28,7 @@ #include #include #include +#include static int vbe_detected = -1; @@ -71,6 +72,200 @@ real2pm (grub_vbe_farptr_t ptr) + ((unsigned long) ptr & 0x0000FFFF)); } +/* Call VESA BIOS 0x4f09 to set palette data, return status. */ +static grub_vbe_status_t +grub_vbe_bios_set_palette_data (grub_uint32_t color_count, + grub_uint32_t start_index, + struct grub_vbe_palette_data *palette_data) +{ + struct grub_bios_int_registers regs; + regs.eax = 0x4f09; + regs.ebx = 0; + regs.ecx = color_count; + regs.edx = start_index; + regs.es = (((grub_addr_t) palette_data) & 0xffff0000) >> 4; + regs.edi = ((grub_addr_t) palette_data) & 0xffff; + regs.flags = GRUB_CPU_INT_FLAGS_DEFAULT; + grub_bios_interrupt (0x10, ®s); + return regs.eax & 0xffff; +} + +/* Call VESA BIOS 0x4f00 to get VBE Controller Information, return status. */ +grub_vbe_status_t +grub_vbe_bios_get_controller_info (struct grub_vbe_info_block *ci) +{ + struct grub_bios_int_registers regs; + /* Store *controller_info to %es:%di. */ + regs.es = (((grub_addr_t) ci) & 0xffff0000) >> 4; + regs.edi = ((grub_addr_t) ci) & 0xffff; + regs.eax = 0x4f00; + regs.flags = GRUB_CPU_INT_FLAGS_DEFAULT; + grub_bios_interrupt (0x10, ®s); + return regs.eax & 0xffff; +} + +/* Call VESA BIOS 0x4f01 to get VBE Mode Information, return status. */ +grub_vbe_status_t +grub_vbe_bios_get_mode_info (grub_uint32_t mode, + struct grub_vbe_mode_info_block *mode_info) +{ + struct grub_bios_int_registers regs; + regs.eax = 0x4f01; + regs.ecx = mode; + /* Store *mode_info to %es:%di. */ + regs.es = ((grub_addr_t) mode_info & 0xffff0000) >> 4; + regs.edi = (grub_addr_t) mode_info & 0x0000ffff; + regs.flags = GRUB_CPU_INT_FLAGS_DEFAULT; + grub_bios_interrupt (0x10, ®s); + return regs.eax & 0xffff; +} + +/* Call VESA BIOS 0x4f02 to set video mode, return status. */ +static grub_vbe_status_t +grub_vbe_bios_set_mode (grub_uint32_t mode, + struct grub_vbe_crtc_info_block *crtc_info) +{ + struct grub_bios_int_registers regs; + + regs.eax = 0x4f02; + regs.ebx = mode; + /* Store *crtc_info to %es:%di. */ + regs.es = (((grub_addr_t) crtc_info) & 0xffff0000) >> 4; + regs.edi = ((grub_addr_t) crtc_info) & 0xffff; + regs.flags = GRUB_CPU_INT_FLAGS_DEFAULT; + grub_bios_interrupt (0x10, ®s); + + return regs.eax & 0xffff; +} + +/* Call VESA BIOS 0x4f03 to return current VBE Mode, return status. */ +grub_vbe_status_t +grub_vbe_bios_get_mode (grub_uint32_t *mode) +{ + struct grub_bios_int_registers regs; + + regs.eax = 0x4f03; + regs.flags = GRUB_CPU_INT_FLAGS_DEFAULT; + grub_bios_interrupt (0x10, ®s); + *mode = regs.ebx & 0xffff; + + return regs.eax & 0xffff; +} + +grub_vbe_status_t +grub_vbe_bios_getset_dac_palette_width (int set, int *dac_mask_size) +{ + struct grub_bios_int_registers regs; + + regs.eax = 0x4f08; + regs.ebx = (*dac_mask_size & 0xff) >> 8; + regs.ebx = set ? 1 : 0; + regs.flags = GRUB_CPU_INT_FLAGS_DEFAULT; + grub_bios_interrupt (0x10, ®s); + *dac_mask_size = (regs.ebx >> 8) & 0xff; + + return regs.eax & 0xffff; +} + +/* Call VESA BIOS 0x4f05 to set memory window, return status. */ +grub_vbe_status_t +grub_vbe_bios_set_memory_window (grub_uint32_t window, + grub_uint32_t position) +{ + struct grub_bios_int_registers regs; + + /* BL = window, BH = 0, Set memory window. */ + regs.ebx = window & 0x00ff; + regs.edx = position; + regs.eax = 0x4f05; + regs.flags = GRUB_CPU_INT_FLAGS_DEFAULT; + grub_bios_interrupt (0x10, ®s); + return regs.eax & 0xffff; +} + +/* Call VESA BIOS 0x4f05 to return memory window, return status. */ +grub_vbe_status_t +grub_vbe_bios_get_memory_window (grub_uint32_t window, + grub_uint32_t *position) +{ + struct grub_bios_int_registers regs; + + regs.eax = 0x4f05; + /* BH = 1, Get memory window. BL = window. */ + regs.ebx = (window & 0x00ff) | 0x100; + regs.flags = GRUB_CPU_INT_FLAGS_DEFAULT; + grub_bios_interrupt (0x10, ®s); + + *position = regs.edx & 0xffff; + return regs.eax & 0xffff; +} + +/* Call VESA BIOS 0x4f06 to set scanline length (in bytes), return status. */ +grub_vbe_status_t +grub_vbe_bios_set_scanline_length (grub_uint32_t length) +{ + struct grub_bios_int_registers regs; + + regs.ecx = length; + regs.eax = 0x4f06; + /* BL = 2, Set Scan Line in Bytes. */ + regs.ebx = 0x0002; + regs.flags = GRUB_CPU_INT_FLAGS_DEFAULT; + grub_bios_interrupt (0x10, ®s); + return regs.eax & 0xffff; +} + +/* Call VESA BIOS 0x4f06 to return scanline length (in bytes), return status. */ +grub_vbe_status_t +grub_vbe_bios_get_scanline_length (grub_uint32_t *length) +{ + struct grub_bios_int_registers regs; + + regs.eax = 0x4f06; + regs.ebx = 0x0001; + regs.flags = GRUB_CPU_INT_FLAGS_DEFAULT; + /* BL = 1, Get Scan Line Length (in bytes). */ + grub_bios_interrupt (0x10, ®s); + + *length = regs.ebx & 0xffff; + return regs.eax & 0xffff; +} + +/* Call VESA BIOS 0x4f07 to set display start, return status. */ +static grub_vbe_status_t +grub_vbe_bios_set_display_start (grub_uint32_t x, grub_uint32_t y) +{ + struct grub_bios_int_registers regs; + + /* Store x in %ecx. */ + regs.ecx = x; + regs.edx = y; + regs.eax = 0x4f07; + /* BL = 80h, Set Display Start during Vertical Retrace. */ + regs.ebx = 0x0080; + regs.flags = GRUB_CPU_INT_FLAGS_DEFAULT; + grub_bios_interrupt (0x10, ®s); + return regs.eax & 0xffff; +} + +/* Call VESA BIOS 0x4f07 to get display start, return status. */ +grub_vbe_status_t +grub_vbe_bios_get_display_start (grub_uint32_t *x, + grub_uint32_t *y) +{ + struct grub_bios_int_registers regs; + + regs.eax = 0x4f07; + /* BL = 1, Get Display Start. */ + regs.ebx = 0x0001; + regs.flags = GRUB_CPU_INT_FLAGS_DEFAULT; + grub_bios_interrupt (0x10, ®s); + + *x = regs.ecx & 0xffff; + *y = regs.edx & 0xffff; + return regs.eax & 0xffff; +} + grub_err_t grub_vbe_probe (struct grub_vbe_info_block *info_block) {