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#include "bios.h"
#include "e820.h"
#include "stdio.h"
#include "ioport.h"
#include "string.h"
#include "fw_cfg.h"
#include "bswap.h"
#include "linuxboot.h"
#include "multiboot.h"
#include "benchmark.h"
struct fw_cfg_file {
uint32_t size;
uint16_t select;
uint16_t unused;
char name[56];
};
static int version;
static int filecnt;
static struct fw_cfg_file *files;
void fw_cfg_setup(void)
{
int i, n;
fw_cfg_select(FW_CFG_ID);
version = fw_cfg_readl_le();
fw_cfg_select(FW_CFG_FILE_DIR);
n = fw_cfg_readl_be();
filecnt = n;
files = malloc_fseg(sizeof(files[0]) * n);
fw_cfg_read(files, sizeof(files[0]) * n);
for (i = 0; i < n; i++) {
struct fw_cfg_file *f = &files[i];
f->size = bswap32(f->size);
f->select = bswap16(f->select);
}
}
int filenamecmp(const char *a, const struct fw_cfg_file *f)
{
int n = sizeof(f->name);
const char *b = f->name;
while (*a == *b) {
if (*a == '\0') {
break;
}
if (--n == 0) {
return *a;
}
++a, ++b;
}
return *a - *b;
}
int fw_cfg_file_id(char *name)
{
int i;
for (i = 0; i < filecnt; i++)
if (!filenamecmp(name, &files[i]))
return i;
return -1;
}
uint32_t fw_cfg_file_size(int id)
{
if (id == -1)
return 0;
return files[id].size;
}
void fw_cfg_file_select(int id)
{
fw_cfg_select(files[id].select);
}
void fw_cfg_read_file(int id, void *buf, int len)
{
fw_cfg_read_entry(files[id].select, buf, len);
}
struct fw_cfg_dma_descriptor {
uint32_t control;
uint32_t length;
uint64_t address;
} __attribute__((packed));
void fw_cfg_dma(int control, void *buf, int len)
{
volatile struct fw_cfg_dma_descriptor dma;
uint32_t dma_desc_addr;
dma.control = bswap32(control);
dma.length = bswap32(len);
dma.address = bswap64((uintptr_t)buf);
dma_desc_addr = (uint32_t)&dma;
outl(FW_CFG_DMA_ADDR_LOW, bswap32(dma_desc_addr));
while (bswap32(dma.control) & ~FW_CFG_DMA_CTL_ERROR) {
asm("");
}
}
void fw_cfg_read(void *buf, int len)
{
if (version & FW_CFG_VERSION_DMA) {
fw_cfg_dma(FW_CFG_DMA_CTL_READ, buf, len);
} else {
insb(buf, FW_CFG_DATA, len);
}
}
void
fw_cfg_read_entry(int e, void *buf, int len)
{
if (version & FW_CFG_VERSION_DMA) {
int control;
control = (e << 16);
control |= FW_CFG_DMA_CTL_SELECT;
control |= FW_CFG_DMA_CTL_READ;
fw_cfg_dma(control, buf, len);
} else {
fw_cfg_select(e);
insb(buf, FW_CFG_DATA, len);
}
}
/* Multiboot trampoline. QEMU does the ELF parsing. */
static void boot_multiboot_from_fw_cfg(void)
{
void *kernel_addr, *kernel_entry;
struct mb_info *mb;
struct mb_mmap_entry *mbmem;
int i;
uint32_t sz;
fw_cfg_select(FW_CFG_KERNEL_SIZE);
sz = fw_cfg_readl_le();
if (!sz)
panic();
fw_cfg_select(FW_CFG_KERNEL_ADDR);
kernel_addr = (void *) fw_cfg_readl_le();
fw_cfg_read_entry(FW_CFG_KERNEL_DATA, kernel_addr, sz);
fw_cfg_select(FW_CFG_INITRD_SIZE);
sz = fw_cfg_readl_le();
if (!sz)
panic();
fw_cfg_select(FW_CFG_INITRD_ADDR);
mb = (struct mb_info *) fw_cfg_readl_le();
fw_cfg_read_entry(FW_CFG_INITRD_DATA, mb, sz);
mb->mem_lower = 639;
mb->mem_upper = (lowmem - 1048576) >> 10;
mb->mmap_length = 0;
for (i = 0; i < e820->nr_map; i++) {
mbmem = (struct mb_mmap_entry *) (mb->mmap_addr + mb->mmap_length);
mbmem->size = sizeof(e820->map[i]);
mbmem->base_addr = e820->map[i].addr;
mbmem->length = e820->map[i].size;
mbmem->type = e820->map[i].type;
mb->mmap_length += sizeof(*mbmem);
}
#ifdef BENCHMARK_HACK
/* Exit just before getting to vmlinuz, so that it is easy
* to time/profile the firmware.
*/
outb(LINUX_EXIT_PORT, LINUX_START_FWCFG);
#endif
fw_cfg_select(FW_CFG_KERNEL_ENTRY);
kernel_entry = (void *) fw_cfg_readl_le();
asm volatile("jmp *%2" : : "a" (0x2badb002), "b"(mb), "c"(kernel_entry));
panic();
}
void boot_from_fwcfg(void)
{
struct linuxboot_args args;
uint32_t kernel_size;
fw_cfg_select(FW_CFG_CMDLINE_SIZE);
args.cmdline_size = fw_cfg_readl_le();
fw_cfg_select(FW_CFG_INITRD_SIZE);
args.initrd_size = fw_cfg_readl_le();
/* QEMU has already split the real mode and protected mode
* parts. Recombine them in args.vmlinuz_size.
*/
fw_cfg_select(FW_CFG_KERNEL_SIZE);
kernel_size = fw_cfg_readl_le();
fw_cfg_select(FW_CFG_SETUP_SIZE);
args.vmlinuz_size = kernel_size + fw_cfg_readl_le();
if (!args.vmlinuz_size)
return;
fw_cfg_select(FW_CFG_SETUP_DATA);
fw_cfg_read(args.header, sizeof(args.header));
if (!parse_bzimage(&args))
boot_multiboot_from_fw_cfg();
/* SETUP_DATA already selected */
if (args.setup_size > sizeof(args.header))
fw_cfg_read(args.setup_addr + sizeof(args.header),
args.setup_size - sizeof(args.header));
fw_cfg_select(FW_CFG_KERNEL_DATA);
fw_cfg_read_entry(FW_CFG_KERNEL_DATA, args.kernel_addr, kernel_size);
fw_cfg_read_entry(FW_CFG_CMDLINE_DATA, args.cmdline_addr, args.cmdline_size);
if (args.initrd_size) {
fw_cfg_read_entry(FW_CFG_INITRD_DATA, args.initrd_addr, args.initrd_size);
}
boot_bzimage(&args);
}
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