2 #include "../port/lib.h"
8 #define VFLAG(...) if(vflag) print(__VA_ARGS__)
10 #define BIOSSEG(a) KADDR(((uint)(a))<<4)
11 #define UPTR2INT(p) ((uintptr)(p))
13 #define l16get(p) (((p)[1]<<8)|(p)[0])
14 #define l32get(p) (((u32int)l16get(p+2)<<16)|l16get(p))
18 typedef struct BIOS32sdh { /* BIOS32 Service Directory Header */
19 u8int signature[4]; /* "_32_" */
20 u8int physaddr[4]; /* physical address of entry point */
22 u8int length; /* of header in paragraphs */
27 typedef struct BIOS32si { /* BIOS32 Service Interface */
28 u8int* base; /* base address of service */
29 int length; /* length of service */
30 u32int offset; /* service entry-point from base */
32 u16int ptr[3]; /* far pointer m16:32 */
35 static Lock bios32lock;
36 static u16int bios32ptr[3];
37 static void* bios32entry;
40 bios32ci(BIOS32si* si, BIOS32ci* ci)
45 r = bios32call(ci, si->ptr);
52 rsdchecksum(void* addr, int length)
57 for(p = addr; length-- > 0; p++)
66 rsdscan(u8int* addr, int len, char* signature)
72 sl = strlen(signature);
73 for(p = addr; p+sl < e; p += 16){
74 if(memcmp(p, signature, sl))
88 VFLAG("bios32link\n");
89 if((sdh = rsdscan(BIOSSEG(0xE000), 0x20000, "_32_")) == nil)
91 if(rsdchecksum(sdh, sizeof(BIOS32sdh)) == nil)
93 VFLAG("sdh @ %#p, entry %#ux\n", sdh, l32get(sdh->physaddr));
95 bios32entry = vmap(l32get(sdh->physaddr), 4096+1);
96 VFLAG("entry @ %#p\n", bios32entry);
97 ptr = UPTR2INT(bios32entry);
98 bios32ptr[0] = ptr & 0xffff;
99 bios32ptr[1] = (ptr>>16) & 0xffff;
100 bios32ptr[2] = KESEL;
101 VFLAG("bios32link: ptr %ux %ux %ux\n",
102 bios32ptr[0], bios32ptr[1], bios32ptr[2]);
108 BIOS32close(BIOS32si* si)
110 vunmap(si->base, si->length);
122 if(bios32ptr[2] == 0 && bios32locate() < 0){
127 VFLAG("bios32si: %s\n", id);
128 memset(&ci, 0, sizeof(BIOS32ci));
129 ci.eax = (id[3]<<24|(id[2]<<16)|(id[1]<<8)|id[0]);
131 bios32call(&ci, bios32ptr);
134 VFLAG("bios32si: eax %ux\n", ci.eax);
137 VFLAG("bios32si: base %#ux length %#ux offset %#ux\n",
138 ci.ebx, ci.ecx, ci.edx);
140 if((si = malloc(sizeof(BIOS32si))) == nil)
142 if((si->base = vmap(ci.ebx, ci.ecx)) == nil){
148 ptr = UPTR2INT(si->base)+ci.edx;
149 si->ptr[0] = ptr & 0xffff;
150 si->ptr[1] = (ptr>>16) & 0xffff;
152 VFLAG("bios32si: eax entry %ux\n", ptr);