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vgasrc: add allocate_pmm() 

Factor out pmm allocation function from stack allocator.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
This commit is contained in:
Gerd Hoffmann 2018-06-15 07:55:47 +02:00
parent a638acfa4c
commit e1a9579acd
2 changed files with 33 additions and 16 deletions
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48
vgasrc/vgainit.c
View File

@ -42,13 +42,9 @@ struct pci_data rom_pci_data VAR16 VISIBLE16 = {
* PMM call and extra stack setup
****************************************************************/
u16 ExtraStackSeg VAR16 VISIBLE16;
static void
allocate_extra_stack(void)
u32
allocate_pmm(u32 size, int highmem, int aligned)
{
if (!CONFIG_VGA_ALLOCATE_EXTRA_STACK)
return;
u32 pmmscan;
for (pmmscan=0; pmmscan < BUILD_BIOS_SIZE; pmmscan+=16) {
struct pmmheader *pmm = (void*)pmmscan;
@ -57,29 +53,49 @@ allocate_extra_stack(void)
if (checksum_far(SEG_BIOS, pmm, GET_FARVAR(SEG_BIOS, pmm->length)))
continue;
struct segoff_s entry = GET_FARVAR(SEG_BIOS, pmm->entry);
dprintf(1, "Attempting to allocate VGA stack via pmm call to %04x:%04x\n"
dprintf(1, "Attempting to allocate %u bytes %s via pmm call to %04x:%04x\n"
, size, highmem ? "highmem" : "lowmem"
, entry.seg, entry.offset);
u16 res1, res2;
u16 flags = 8 |
( highmem ? 2 : 1 )|
( aligned ? 4 : 0 );
size >>= 4;
asm volatile(
"pushl %0\n"
"pushw $(8|1)\n" // Permanent low memory request
"pushw %2\n" // flags
"pushl $0xffffffff\n" // Anonymous handle
"pushl $" __stringify(CONFIG_VGA_EXTRA_STACK_SIZE/16) "\n"
"pushl %1\n" // size
"pushw $0x00\n" // PMM allocation request
"lcallw *12(%%esp)\n"
"addl $16, %%esp\n"
"cli\n"
"cld\n"
: "+r" (entry.segoff), "=a" (res1), "=d" (res2) : : "cc", "memory");
: "+r" (entry.segoff), "+r" (size), "+r" (flags),
"=a" (res1), "=d" (res2) : : "cc", "memory");
u32 res = res1 | (res2 << 16);
if (!res || res == PMM_FUNCTION_NOT_SUPPORTED)
return;
dprintf(1, "VGA stack allocated at %x\n", res);
SET_VGA(ExtraStackSeg, res >> 4);
extern void entry_10_extrastack(void);
SET_IVT(0x10, SEGOFF(get_global_seg(), (u32)entry_10_extrastack));
return;
return 0;
return res;
}
return 0;
}
u16 ExtraStackSeg VAR16 VISIBLE16;
static void
allocate_extra_stack(void)
{
if (!CONFIG_VGA_ALLOCATE_EXTRA_STACK)
return;
u32 res = allocate_pmm(CONFIG_VGA_EXTRA_STACK_SIZE, 0, 0);
if (!res)
return;
dprintf(1, "VGA stack allocated at %x\n", res);
SET_VGA(ExtraStackSeg, res >> 4);
extern void entry_10_extrastack(void);
SET_IVT(0x10, SEGOFF(get_global_seg(), (u32)entry_10_extrastack));
return;
}

1
vgasrc/vgautil.h
View File

@ -92,6 +92,7 @@ extern u8 vgafont16alt[];
// vgainit.c
extern int VgaBDF;
extern int HaveRunInit;
u32 allocate_pmm(u32 size, int highmem, int aligned);
// vgaversion.c
extern const char VERSION[], BUILDINFO[];