diff options
Diffstat (limited to 'sfi.c')
| -rw-r--r-- | sfi.c | 80 |
1 files changed, 80 insertions, 0 deletions
@@ -0,0 +1,80 @@ +#include "types.h" +#include "bootparam.h" +#include "bootstub.h" +#include "spi-uart.h" +#include "sfi.h" + +#define bs_printk(x) { if (!*(int *)SPI_UART_SUPPRESSION) bs_spi_printk(x); } + +#define SFI_BASE_ADDR 0x000E0000 +#define SFI_LENGTH 0x00020000 + +static unsigned long sfi_search_mmap(unsigned long start, int len) +{ + unsigned long i = 0; + char *pchar = (char *)start; + + for (i = 0; i < len; i += 4, pchar += 4) { + if (pchar[0] == 'M' + && pchar[1] == 'M' + && pchar[2] == 'A' + && pchar[3] == 'P') + return start + i; + } + return 0; +} + +void sfi_setup_e820(struct boot_params *bp) +{ + struct sfi_table *sb; + struct sfi_mem_entry *mentry; + unsigned long long start, end, size; + int i, num, type, total; + + bp->e820_entries = 0; + total = 0; + + /* search for sfi mmap table */ + sb = (struct sfi_table *)sfi_search_mmap(SFI_BASE_ADDR, SFI_LENGTH); + if (!sb) + return; + + bs_printk("Bootstub: will use sfi mmap table for e820 table\n"); + num = SFI_GET_ENTRY_NUM(sb, sfi_mem_entry); + mentry = (struct sfi_mem_entry *)sb->pentry; + + for (i = 0; i < num; i++) { + start = mentry->phy_start; + size = mentry->pages << 12; + end = start + size; + + if (start > end) + continue; + + /* translate SFI mmap type to E820 map type */ + switch (mentry->type) { + case SFI_MEM_CONV: + type = E820_RAM; + break; + case SFI_MEM_MMIO: + case SFI_MEM_UNUSABLE: + case SFI_RUNTIME_SERVICE_DATA: + mentry++; + continue; + default: + type = E820_RESERVED; + } + + if (total == E820MAX) + break; + bp->e820_map[total].addr = start; + bp->e820_map[total].size = size; + bp->e820_map[total++].type = type; + + mentry++; + } + + bp->e820_entries = total; +} + + |