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x86: Add infrastructure to extract an e820 table from the coreboot tables

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Also approximate the size of RAM using the largest RAM address available
in the tables. There may be areas which are marked as reserved which are
actually at the end of RAM.

Signed-off-by: Gabe Black <gabeblack@chromium.org>
This commit is contained in:
Gabe Black 2011-12-05 12:09:25 +00:00 committed by Graeme Russ
parent 233dbc1194
commit f08fa7a201
1 changed files with 37 additions and 1 deletions
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38
arch/x86/cpu/coreboot/sdram.c
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@ -23,13 +23,49 @@
*/
#include <common.h>
#include <malloc.h>
#include <asm/e820.h>
#include <asm/u-boot-x86.h>
#include <asm/global_data.h>
#include <asm/arch-coreboot/sysinfo.h>
#include <asm/arch-coreboot/tables.h>
DECLARE_GLOBAL_DATA_PTR;
unsigned install_e820_map(unsigned max_entries, struct e820entry *entries)
{
int i;
unsigned num_entries = min(lib_sysinfo.n_memranges, max_entries);
if (num_entries < lib_sysinfo.n_memranges) {
printf("Warning: Limiting e820 map to %d entries.\n",
num_entries);
}
for (i = 0; i < num_entries; i++) {
struct memrange *memrange = &lib_sysinfo.memrange[i];
entries[i].addr = memrange->base;
entries[i].size = memrange->size;
entries[i].type = memrange->type;
}
return num_entries;
}
int dram_init_f(void)
{
gd->ram_size = 64*1024*1024;
int i;
phys_size_t ram_size = 0;
for (i = 0; i < lib_sysinfo.n_memranges; i++) {
struct memrange *memrange = &lib_sysinfo.memrange[i];
unsigned long long end = memrange->base + memrange->size;
if (memrange->type == CB_MEM_RAM && end > ram_size)
ram_size = end;
}
gd->ram_size = ram_size;
if (ram_size == 0)
return -1;
return 0;
}