vbatts/grub
1
0
Fork 0
Code Issues Pull requests Releases Wiki Activity

intwrap grub_get_mmap_entry

Browse source
This commit is contained in:
Vladimir 'phcoder' Serbinenko 2010-04-10 19:12:04 +02:00
parent 0d06476b05
commit f632937ab5
3 changed files with 47 additions and 93 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

5
include/grub/i386/pc/init.h
View file

@ -23,11 +23,6 @@
#include <grub/symbol.h>
#include <grub/machine/memory.h>
/* Get a memory map entry. Return next continuation value. Zero means
the end. */
grub_uint32_t grub_get_mmap_entry (struct grub_machine_mmap_entry *entry,
grub_uint32_t cont);
/* Turn on/off Gate A20. */
void grub_gate_a20 (int on);

47
kern/i386/pc/mmap.c
View file

@ -61,6 +61,53 @@ grub_get_eisa_mmap (void)
return (regs.eax & 0xffff) | (regs.ebx << 16);
}
/*
*
* grub_get_mmap_entry(addr, cont) : address and old continuation value (zero to
* start), for the Query System Address Map BIOS call.
*
* Sets the first 4-byte int value of "addr" to the size returned by
* the call. If the call fails, sets it to zero.
*
* Returns: new (non-zero) continuation value, 0 if done.
*/
/* Get a memory map entry. Return next continuation value. Zero means
the end. */
static grub_uint32_t
grub_get_mmap_entry (struct grub_machine_mmap_entry *entry,
grub_uint32_t cont)
{
struct grub_bios_int_registers regs;
regs.flags = GRUB_CPU_INT_FLAGS_DEFAULT;
/* place address (+4) in ES:DI */
regs.es = ((grub_addr_t) &entry->addr) >> 4;
regs.edi = ((grub_addr_t) &entry->addr) & 0xf;
/* set continuation value */
regs.ebx = cont;
/* set default maximum buffer size */
regs.ecx = sizeof (*entry) - sizeof (entry->size);
/* set EDX to 'SMAP' */
regs.edx = 0x534d4150;
regs.eax = 0xe820;
grub_bios_interrupt (0x15, &regs);
/* write length of buffer (zero if error) into ADDR */
if ((regs.flags & GRUB_CPU_INT_FLAGS_CARRY) || regs.eax != 0x534d4150
|| regs.ecx < 0x14 || regs.ecx > 0x400)
entry->size = 0;
else
entry->size = regs.ecx;
/* return the continuation value */
return regs.ebx;
}
grub_err_t
grub_machine_mmap_iterate (int NESTED_FUNC_ATTR (*hook) (grub_uint64_t, grub_uint64_t, grub_uint32_t))
{

88
kern/i386/pc/startup.S
View file

@ -505,94 +505,6 @@ FUNCTION(grub_chainloader_real_boot)
#include "../loader.S"
/*
*
* grub_get_mmap_entry(addr, cont) : address and old continuation value (zero to
* start), for the Query System Address Map BIOS call.
*
* Sets the first 4-byte int value of "addr" to the size returned by
* the call. If the call fails, sets it to zero.
*
* Returns: new (non-zero) continuation value, 0 if done.
*/
FUNCTION(grub_get_mmap_entry)
pushl %ebp
pushl %ebx
pushl %edi
pushl %esi
/* push ADDR */
pushl %eax
/* place address (+4) in ES:DI */
addl $4, %eax
movl %eax, %edi
andl $0xf, %edi
shrl $4, %eax
movl %eax, %esi
/* set continuation value */
movl %edx, %ebx
/* set default maximum buffer size */
movl $0x14, %ecx
/* set EDX to 'SMAP' */
movl $0x534d4150, %edx
call prot_to_real /* enter real mode */
.code16
movw %si, %es
movl $0xe820, %eax
int $0x15
DATA32 jc xnosmap
cmpl $0x534d4150, %eax
jne xnosmap
cmpl $0x14, %ecx
jl xnosmap
cmpl $0x400, %ecx
jg xnosmap
jmp xsmap
xnosmap:
xorl %ecx, %ecx
/* Apple's cc jumps few bytes before the correct
label in this context. Hence nops. */
#ifdef APPLE_CC
nop
nop
nop
nop
nop
nop
#endif
xsmap:
DATA32 call real_to_prot
.code32
/* write length of buffer (zero if error) into ADDR */
popl %eax
movl %ecx, (%eax)
/* set return value to continuation */
movl %ebx, %eax
popl %esi
popl %edi
popl %ebx
popl %ebp
ret
/*
* void grub_console_real_putchar (int c)
*