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elilo/x86_64/bzimage.c

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/*
* Copyright (C) 2001-2003 Hewlett-Packard Co.
* Contributed by Stephane Eranian <eranian@hpl.hp.com>
* Contributed by Mike Johnston <johnston@intel.com>
* Contributed by Chris Ahna <christopher.j.ahna@intel.com>
*
* This file is part of the ELILO, the EFI Linux boot loader.
*
* ELILO is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* ELILO is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with ELILO; see the file COPYING. If not, write to the Free
* Software Foundation, 59 Temple Place - Suite 330, Boston, MA
* 02111-1307, USA.
*
* Please check out the elilo.txt for complete documentation on how
* to use this program.
*/
#include <efi.h>
#include <efilib.h>
#include "elilo.h"
#include "loader.h"
boot_params_t *param_start = NULL;
UINTN param_size = 0;
UINTN kernel_size = 0x800000; /* 8M (default x86_64 bzImage size limit) */
static VOID *
bzImage_alloc()
{
UINTN pages = EFI_SIZE_TO_PAGES(kernel_size);
int reloc_kernel = 0;
VOID *kla, *kend = kernel_start + kernel_size;
UINT32 kalign, kmask;
boot_params_t *ps = param_start;
/*
* Get address for kernel from header, if applicable & available.
*/
if ((ps->s.hdr_major < 2) ||
(ps->s.hdr_major == 2 && ps->s.hdr_minor < 5)) {
reloc_kernel = 0;
} else {
if (ps->s.kernel_start >= DEFAULT_KERNEL_START)
kernel_start = (void *)(UINT64)ps->s.kernel_start;
reloc_kernel = ps->s.relocatable_kernel;
kalign = ps->s.kernel_alignment;
kmask = kalign - 1;
VERB_PRT(3, Print(L"kernel header (%d.%d) suggests kernel "
"start at address "PTR_FMT" (%srelocatable!)\n",
ps->s.hdr_major, ps->s.hdr_minor, ps->s.kernel_start,
(reloc_kernel ? L"": L"not ")));
}
/*
* Best effort for old (< 2.6.20) and non-relocatable kernels
*/
if (alloc_kmem(kernel_start, pages) == 0) {
VERB_PRT(3, Print(L"kernel_start: "PTR_FMT" kernel_size: %d\n",
kernel_start, kernel_size));
return kernel_start;
} else if ( ! reloc_kernel ) {
/*
* Couldn't get desired address--just load it anywhere and
* (try to) move it later. It's the only chance for non-
* relocatable kernels, but it breaks occassionally...
*/
ERR_PRT((L"Kernel header (%d.%d) suggests kernel "
"start at address "PTR_FMT" (non relocatable!)\n"
"This address is not available, so an attempt"
"is made to copy the kernel there later on\n"
"BEWARE: this is unsupported and may not work. "
"Please update your kernel.\n",
ps->s.hdr_major, ps->s.hdr_minor, ps->s.kernel_start));
kla = (VOID *)(UINT32_MAX - kernel_size);
/* NULL would preserve the "anywhere" semantic, */
/* but it would not prevent allocation above 4GB! */
if (alloc_kmem_anywhere(&kla, pages) != 0) {
/* out of luck */
return NULL;
}
VERB_PRT(3, Print(L"kernel_start: "PTR_FMT
" kernel_size: %d loading at: "PTR_FMT"\n",
kernel_start, kernel_size, kla));
return kla;
}
/* Is 'ps->s.kernel_alignment' guaranteed to be sane? */
if (kalign < EFI_PAGE_SIZE) {
kalign = EFI_PAGE_SIZE;
kmask = EFI_PAGE_MASK;
}
DBG_PRT((L"alignment: kernel=0x%x efi_page=0x%x : 0x%x\n",
ps->s.kernel_alignment, EFI_PAGE_SIZE, kalign));
/*
* Couldn't get the preferred address, but luckily it's
* a relocatable kernel, so ...
*
* 1. use 'find_kernel_memory()' (like Itanium)
* 2. try out the 16 lowest possible aligned addresses (> 0)
* 3. get enough memory to align "creatively"
* 4. forget alignment (and start praying)...
*/
/* 1. */
if ((find_kernel_memory(kernel_start, kend, kalign, &kla) != 0) ||
(alloc_kmem(kla, pages) != 0)) {
kla = NULL;
}
/* 2. */
if ( ! kla && (UINT64)kernel_start < kalign ) {
int i;
for ( i = 1; i < 16 && !kla; i++ ) {
VOID *tmp = (VOID *)((UINT64)kalign * i);
if (alloc_kmem(tmp, pages) == 0) {
kla = tmp;
}
}
}
/* 3. */
if ( ! kla ) {
UINTN apages = EFI_SIZE_TO_PAGES(kernel_size + kmask);
kla = (VOID *)(UINT32_MAX - kernel_size - kmask);
if (alloc_kmem_anywhere(&kla, apages) == 0) {
kla = (VOID *)(((UINT64)kla + kmask) & ~kmask);
} else {
kla = NULL;
}
}
/* 4. last resort */
if ( ! kla ) {
kla = (VOID *)(UINT32_MAX - kernel_size);
if (alloc_kmem_anywhere(&kla, pages) != 0) {
return NULL;
}
}
kernel_start = kla;
VERB_PRT(1, Print(L"relocating kernel_start: "PTR_FMT
" kernel_size: %d\n", kernel_start, kernel_size));
return kla;
}
static INTN
bzImage_probe(CHAR16 *kname)
{
EFI_STATUS efi_status;
UINTN size;
fops_fd_t fd;
UINT8 bootsect[512];
DBG_PRT((L"probe_bzImage_boot()\n"));
if (!kname) {
ERR_PRT((L"kname == %xh", kname));
free_kmem();
return -1;
}
/*
* Open kernel image.
*/
DBG_PRT((L"opening %s...\n", kname));
efi_status = fops_open(kname, &fd);
if (EFI_ERROR(efi_status)) {
ERR_PRT((L"Could not open %s.", kname));
free_kmem();
return -1;
}
/*
* Read boot sector.
*/
DBG_PRT((L"\nreading boot sector...\n"));
size = sizeof bootsect;
efi_status = fops_read(fd, bootsect, &size);
if (EFI_ERROR(efi_status) || size != sizeof bootsect) {
ERR_PRT((L"Could not read boot sector from %s.", kname));
fops_close(fd);
free_kmem();
return -1;
}
/*
* Verify boot sector signature.
*/
if (bootsect[0x1FE] != 0x55 || bootsect[0x1FF] != 0xAA) {
ERR_PRT((L"%s is not a bzImage kernel image.\n", kname));
fops_close(fd);
free_kmem();
return -1;
}
/*
* Check for out of range setup data size.
* Will almost always be 7, but we will accept 1 to 64.
*/
DBG_PRT((L"bootsect[1F1h] == %d setup sectors\n", bootsect[0x1F1]));
if (bootsect[0x1F1] < 1 || bootsect[0x1F1] > 64) {
ERR_PRT((L"%s is not a valid bzImage kernel image.",
kname));
fops_close(fd);
free_kmem();
return -1;
}
/*
* Allocate and read setup data.
*/
DBG_PRT((L"reading setup data...\n"));
param_size = (bootsect[0x1F1] + 1) * 512;
param_start = alloc(param_size, EfiLoaderData);
DBG_PRT((L"param_size=%d param_start=%x", param_size, param_start));
if (!param_start) {
ERR_PRT((L"Could not allocate %d bytes of setup data.",
param_size));
fops_close(fd);
free_kmem();
return -1;
}
CopyMem(param_start, bootsect, sizeof bootsect);
size = param_size - 512;
efi_status = fops_read(fd, ((UINT8 *)param_start) + 512, &size);
if (EFI_ERROR(efi_status) || size != param_size - 512) {
ERR_PRT((L"Could not read %d bytes of setup data.",
param_size - 512));
free(param_start);
param_start = NULL;
param_size = 0;
fops_close(fd);
free_kmem();
return -1;
}
/*
* Check for setup data signature.
*/
{
UINT8 *c = ((UINT8 *)param_start)+514;
DBG_PRT((L"param_start(c=%x): %c-%c-%c-%c",
c, (CHAR16)c[0],(CHAR16) c[1], (CHAR16)c[2], (CHAR16)c[3]));
}
if (CompareMem(((UINT8 *)param_start) + 514, "HdrS", 4)) {
ERR_PRT((L"%s does not have a setup signature.",
kname));
free(param_start);
param_start = NULL;
param_size = 0;
fops_close(fd);
free_kmem();
return -1;
}
/*
* Allocate memory for kernel.
*/
kernel_load_address = bzImage_alloc();
if ( ! kernel_load_address ) {
ERR_PRT((L"Could not allocate memory for kernel."));
free(param_start);
param_start = NULL;
param_size = 0;
fops_close(fd);
return -1;
}
/*
* Now read the rest of the kernel image into memory.
*/
Print(L"Loading kernel %s... ", kname);
size = kernel_size;
efi_status = fops_read(fd, kernel_load_address, &size);
if (EFI_ERROR(efi_status) || size < 0x10000) {
ERR_PRT((L"Error reading kernel image (0x%x).", efi_status));
free(param_start);
param_start = NULL;
param_size = 0;
fops_close(fd);
free_kmem();
return -1;
} else {
Print(L" done\n");
}
DBG_PRT((L"kernel image read: %d bytes, %d Kbytes\n", size, size / 1024));
/*
* Boot sector, setup data and kernel image loaded.
*/
fops_close(fd);
return 0;
}
/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
static INTN
bzImage_load(CHAR16 *kname, kdesc_t *kd)
{
DBG_PRT((L"load_bzImage_boot()\n"));
if (!kname || !kd) {
ERR_PRT((L"kname="PTR_FMT" kd="PTR_FMT"", kname, kd));
free(param_start);
param_start = NULL;
param_size = 0;
free_kmem();
return -1;
}
kd->kstart = kd->kentry = kernel_start;
kd->kend = ((UINT8 *)kd->kstart) + kernel_size;
DBG_PRT((L"kstart="PTR_FMT" kentry="PTR_FMT" kend="PTR_FMT"\n", kd->kstart, kd->kentry, kd->kend));
return 0;
}
/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
loader_ops_t bzimage_loader = {
NULL,
L"bzImage_loader",
&bzImage_probe,
&bzImage_load
};
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