ref: f24038d601ebe23a213ca1eaf2cf2faa47c22873
dir: /sys/src/boot/efi/efi.c/
#include <u.h>
#include "fns.h"
#include "efi.h"
UINTN MK;
EFI_HANDLE IH;
EFI_SYSTEM_TABLE *ST;
void* (*open)(char *name);
int (*read)(void *f, void *data, int len);
void (*close)(void *f);
/*
* on ia32 and amd64, we use IMAGE_FILE_RELOCS_STRIPPED which
* disables relocations, so this is a no-op.
*
* on arm64, the EFI loader can move our code, so we need to
* update some of our stored addresses (such as callbacks)
* which assume we are loaded at our requested base address.
*/
extern void *rebase(void *addr);
void
putc(int c)
{
CHAR16 w[2];
w[0] = c;
w[1] = 0;
eficall(ST->ConOut->OutputString, ST->ConOut, w);
}
int
getc(void)
{
EFI_INPUT_KEY k;
if(eficall(ST->ConIn->ReadKeyStroke, ST->ConIn, &k))
return 0;
return k.UnicodeChar;
}
void
usleep(int us)
{
eficall(ST->BootServices->Stall, (UINTN)us);
}
void
unload(void)
{
eficall(ST->BootServices->ExitBootServices, IH, MK);
}
void
memconf(char **cfg)
{
static uchar memtype[EfiMaxMemoryType] = {
[EfiReservedMemoryType] 2,
[EfiLoaderCode] 1,
[EfiLoaderData] 1,
[EfiBootServicesCode] 2,
[EfiBootServicesData] 2,
[EfiRuntimeServicesCode] 2,
[EfiRuntimeServicesData] 2,
[EfiConventionalMemory] 1,
[EfiUnusableMemory] 2,
[EfiACPIReclaimMemory] 3,
[EfiACPIMemoryNVS] 4,
[EfiMemoryMappedIO] 2,
[EfiMemoryMappedIOPortSpace] 2,
[EfiPalCode] 2,
};
UINTN mapsize, entsize;
EFI_MEMORY_DESCRIPTOR *t;
uchar mapbuf[96*1024], *p, m;
UINT32 entvers;
char *s;
mapsize = sizeof(mapbuf);
entsize = sizeof(EFI_MEMORY_DESCRIPTOR);
entvers = 1;
if(eficall(ST->BootServices->GetMemoryMap, &mapsize, mapbuf, &MK, &entsize, &entvers))
return;
/* only called to get MK for ExitBootServices() */
if(cfg == nil)
return;
s = *cfg;
for(p = mapbuf; mapsize >= entsize; p += entsize, mapsize -= entsize){
t = (EFI_MEMORY_DESCRIPTOR*)p;
m = 0;
if(t->Type < EfiMaxMemoryType)
m = memtype[t->Type];
if(m == 0)
continue;
if(s == *cfg)
memmove(s, "*e820=", 6), s += 6;
s = hexfmt(s, 1, m), *s++ = ' ';
s = hexfmt(s, 16, t->PhysicalStart), *s++ = ' ';
s = hexfmt(s, 16, t->PhysicalStart + t->NumberOfPages * 4096ULL), *s++ = ' ';
}
*s = '\0';
if(s > *cfg){
s[-1] = '\n';
/* print(*cfg); -- no printing allowed, can change MK */
*cfg = s;
}
}
static void
acpiconf(char **cfg)
{
static EFI_GUID ACPI_20_TABLE_GUID = {
0x8868e871, 0xe4f1, 0x11d3,
0xbc, 0x22, 0x00, 0x80,
0xc7, 0x3c, 0x88, 0x81,
};
static EFI_GUID ACPI_10_TABLE_GUID = {
0xeb9d2d30, 0x2d88, 0x11d3,
0x9a, 0x16, 0x00, 0x90,
0x27, 0x3f, 0xc1, 0x4d,
};
EFI_CONFIGURATION_TABLE *t;
uintptr pa;
char *s;
int n;
pa = 0;
t = ST->ConfigurationTable;
n = ST->NumberOfTableEntries;
while(--n >= 0){
if(memcmp(&t->VendorGuid, &ACPI_10_TABLE_GUID, sizeof(EFI_GUID)) == 0){
if(pa == 0)
pa = (uintptr)t->VendorTable;
} else if(memcmp(&t->VendorGuid, &ACPI_20_TABLE_GUID, sizeof(EFI_GUID)) == 0)
pa = (uintptr)t->VendorTable;
t++;
}
if(pa){
s = *cfg;
memmove(s, "*acpi=0x", 8), s += 8;
s = hexfmt(s, 0, pa), *s++ = '\n';
*s = '\0';
print(*cfg);
*cfg = s;
}
}
static int
topbit(ulong mask)
{
int bit = 0;
while(mask != 0){
mask >>= 1;
bit++;
}
return bit;
}
static int
lowbit(ulong mask)
{
int bit = 0;
while((mask & 1) == 0){
mask >>= 1;
bit++;
}
return bit;
}
static void
screenconf(char **cfg)
{
static EFI_GUID EFI_GRAPHICS_OUTPUT_PROTOCOL_GUID = {
0x9042a9de, 0x23dc, 0x4a38,
0x96, 0xfb, 0x7a, 0xde,
0xd0, 0x80, 0x51, 0x6a,
};
EFI_GRAPHICS_OUTPUT_PROTOCOL *gop;
EFI_HANDLE *Handles;
UINTN Count;
EFI_GRAPHICS_OUTPUT_MODE_INFORMATION *info;
ulong mr, mg, mb, mx, mc;
int i, bits, depth;
char *s;
Count = 0;
Handles = nil;
if(eficall(ST->BootServices->LocateHandleBuffer,
ByProtocol, &EFI_GRAPHICS_OUTPUT_PROTOCOL_GUID, nil, &Count, &Handles))
return;
for(i=0; i<Count; i++){
gop = nil;
if(eficall(ST->BootServices->HandleProtocol,
Handles[i], &EFI_GRAPHICS_OUTPUT_PROTOCOL_GUID, &gop))
continue;
if(gop == nil)
continue;
if((info = gop->Mode->Info) == nil)
continue;
switch(info->PixelFormat){
default:
continue; /* unsupported */
case PixelRedGreenBlueReserved8BitPerColor:
mr = 0x000000ff;
mg = 0x0000ff00;
mb = 0x00ff0000;
mx = 0xff000000;
break;
case PixelBlueGreenRedReserved8BitPerColor:
mb = 0x000000ff;
mg = 0x0000ff00;
mr = 0x00ff0000;
mx = 0xff000000;
break;
case PixelBitMask:
mr = info->PixelInformation.RedMask;
mg = info->PixelInformation.GreenMask;
mb = info->PixelInformation.BlueMask;
mx = info->PixelInformation.ReservedMask;
break;
}
if((depth = topbit(mr | mg | mb | mx)) == 0)
continue;
/* make sure we have linear framebuffer */
if(gop->Mode->FrameBufferBase == 0)
continue;
if(gop->Mode->FrameBufferSize == 0)
continue;
goto Found;
}
return;
Found:
s = *cfg;
memmove(s, "*bootscreen=", 12), s += 12;
s = decfmt(s, 0, info->PixelsPerScanLine), *s++ = 'x';
s = decfmt(s, 0, info->VerticalResolution), *s++ = 'x';
s = decfmt(s, 0, depth), *s++ = ' ';
while(depth > 0){
if(depth == topbit(mr)){
mc = mr;
*s++ = 'r';
} else if(depth == topbit(mg)){
mc = mg;
*s++ = 'g';
} else if(depth == topbit(mb)){
mc = mb;
*s++ = 'b';
} else if(depth == topbit(mx)){
mc = mx;
*s++ = 'x';
} else {
break;
}
bits = depth - lowbit(mc);
s = decfmt(s, 0, bits);
depth -= bits;
}
*s++ = ' ';
*s++ = '0', *s++ = 'x';
s = hexfmt(s, 0, gop->Mode->FrameBufferBase), *s++ = '\n';
*s = '\0';
print(*cfg);
*cfg = s;
}
void
eficonfig(char **cfg)
{
/* memconf(cfg); -- must be called right before unload() */
acpiconf(cfg);
screenconf(cfg);
}
EFI_STATUS
efimain(EFI_HANDLE ih, EFI_SYSTEM_TABLE *st)
{
char path[MAXPATH], *kern;
void *f;
IH = ih;
ST = st;
f = nil;
if(pxeinit(&f) && isoinit(&f) && fsinit(&f))
print("no boot devices\n");
read = rebase(read);
close = rebase(close);
open = rebase(open);
for(;;){
kern = configure(f, path);
f = open(kern);
if(f == nil){
print("not found\n");
continue;
}
print(bootkern(f));
print("\n");
f = nil;
}
}