0431ea242d
nobody passes us the "RSD PTR " address when doing multiboot/kexec on UEFI systems. so we search for it manually in the ACPI reserved area as indicated in the e820 memory map.
122 lines
2.5 KiB
C
122 lines
2.5 KiB
C
#include "u.h"
|
|
#include "../port/lib.h"
|
|
#include "mem.h"
|
|
#include "dat.h"
|
|
#include "fns.h"
|
|
#include "io.h"
|
|
|
|
#define VFLAG(...) if(vflag) print(__VA_ARGS__)
|
|
|
|
#define UPTR2INT(p) ((uintptr)(p))
|
|
|
|
#define l16get(p) (((p)[1]<<8)|(p)[0])
|
|
#define l32get(p) (((u32int)l16get(p+2)<<16)|l16get(p))
|
|
|
|
static int vflag = 0;
|
|
|
|
typedef struct BIOS32sdh { /* BIOS32 Service Directory Header */
|
|
u8int signature[4]; /* "_32_" */
|
|
u8int physaddr[4]; /* physical address of entry point */
|
|
u8int revision;
|
|
u8int length; /* of header in paragraphs */
|
|
u8int checksum; /* */
|
|
u8int reserved[5];
|
|
} BIOS32sdh;
|
|
|
|
typedef struct BIOS32si { /* BIOS32 Service Interface */
|
|
u8int* base; /* base address of service */
|
|
int length; /* length of service */
|
|
u32int offset; /* service entry-point from base */
|
|
|
|
u16int ptr[3]; /* far pointer m16:32 */
|
|
} BIOS32si;
|
|
|
|
static Lock bios32lock;
|
|
static u16int bios32ptr[3];
|
|
static void* bios32entry;
|
|
|
|
int
|
|
bios32ci(BIOS32si* si, BIOS32ci* ci)
|
|
{
|
|
int r;
|
|
|
|
lock(&bios32lock);
|
|
r = bios32call(ci, si->ptr);
|
|
unlock(&bios32lock);
|
|
|
|
return r;
|
|
}
|
|
|
|
static int
|
|
bios32locate(void)
|
|
{
|
|
uintptr ptr;
|
|
BIOS32sdh *sdh;
|
|
|
|
VFLAG("bios32link\n");
|
|
if((sdh = sigsearch("_32_", sizeof(BIOS32sdh))) == nil)
|
|
return -1;
|
|
VFLAG("sdh @ %#p, entry %#ux\n", sdh, l32get(sdh->physaddr));
|
|
|
|
bios32entry = vmap(l32get(sdh->physaddr), 4096+1);
|
|
VFLAG("entry @ %#p\n", bios32entry);
|
|
ptr = UPTR2INT(bios32entry);
|
|
bios32ptr[0] = ptr & 0xffff;
|
|
bios32ptr[1] = (ptr>>16) & 0xffff;
|
|
bios32ptr[2] = KESEL;
|
|
VFLAG("bios32link: ptr %ux %ux %ux\n",
|
|
bios32ptr[0], bios32ptr[1], bios32ptr[2]);
|
|
|
|
return 0;
|
|
}
|
|
|
|
void
|
|
BIOS32close(BIOS32si* si)
|
|
{
|
|
vunmap(si->base, si->length);
|
|
free(si);
|
|
}
|
|
|
|
BIOS32si*
|
|
bios32open(char* id)
|
|
{
|
|
uint ptr;
|
|
BIOS32ci ci;
|
|
BIOS32si *si;
|
|
|
|
lock(&bios32lock);
|
|
if(bios32ptr[2] == 0 && bios32locate() < 0){
|
|
unlock(&bios32lock);
|
|
return nil;
|
|
}
|
|
|
|
VFLAG("bios32si: %s\n", id);
|
|
memset(&ci, 0, sizeof(BIOS32ci));
|
|
ci.eax = (id[3]<<24|(id[2]<<16)|(id[1]<<8)|id[0]);
|
|
|
|
bios32call(&ci, bios32ptr);
|
|
unlock(&bios32lock);
|
|
|
|
VFLAG("bios32si: eax %ux\n", ci.eax);
|
|
if(ci.eax & 0xff)
|
|
return nil;
|
|
VFLAG("bios32si: base %#ux length %#ux offset %#ux\n",
|
|
ci.ebx, ci.ecx, ci.edx);
|
|
|
|
if((si = malloc(sizeof(BIOS32si))) == nil)
|
|
return nil;
|
|
if((si->base = vmap(ci.ebx, ci.ecx)) == nil){
|
|
free(si);
|
|
return nil;
|
|
}
|
|
si->length = ci.ecx;
|
|
|
|
ptr = UPTR2INT(si->base)+ci.edx;
|
|
si->ptr[0] = ptr & 0xffff;
|
|
si->ptr[1] = (ptr>>16) & 0xffff;
|
|
si->ptr[2] = KESEL;
|
|
VFLAG("bios32si: eax entry %ux\n", ptr);
|
|
|
|
return si;
|
|
}
|