sravan/system76-coreboot
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

- Initial checkin of the freebios2 tree

Browse Source 
git-svn-id: svn://svn.coreboot.org/coreboot/trunk@784 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1
This commit is contained in:
Eric Biederman
2003-04-22 19:02:15 +00:00
parent b138ac83b5
commit 8ca8d7665d
109 changed files with 13965 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

59
src/cpu/k8/cpufixup.c Normal file
View File

@@ -0,0 +1,59 @@
/* Needed so the AMD K8 runs correctly. */
#include <console/console.h>
#include <mem.h>
#include <cpu/p6/msr.h>
#define TOP_MEM 0xc001001A
#define TOP_MEM2 0xc001001D
#define IORR_FIRST 0xC0010016
#define IORR_LAST 0xC0010019
#define SYSCFG 0xC0010010
#define MTRRVARDRAMEN (1 << 20)
void k8_cpufixup(struct mem_range *mem)
{
unsigned long lo = 0, hi = 0, i;
unsigned long ram_megabytes;
/* For now no Athlon board has significant holes in it's
* address space so just find the last memory region
* and compute the end of memory from that.
*/
for(i = 0; mem[i].sizek; i++)
;
if (i == 0)
return;
ram_megabytes = (mem[i-1].basek + mem[i-1].sizek) *1024;
// 8 MB alignment please
ram_megabytes += 0x7fffff;
ram_megabytes &= (~0x7fffff);
// set top_mem registers to ram size
printk_spew("Setting top_mem to 0x%x\n", ram_megabytes);
rdmsr(TOP_MEM, lo, hi);
printk_spew("TOPMEM was 0x%02x:0x%02x\n", hi, lo);
hi = 0;
lo = ram_megabytes;
wrmsr(TOP_MEM, lo, hi);
// I am setting this even though I won't enable it
wrmsr(TOP_MEM2, lo, hi);
/* zero the IORR's before we enable to prevent
* undefined side effects
*/
lo = hi = 0;
for (i = IORR_FIRST; i <= IORR_LAST; i++)
wrmsr(i, lo, hi);
rdmsr(SYSCFG, lo, hi);
printk_spew("SYSCFG was 0x%x:0x%x\n", hi, lo);
lo |= MTRRVARDRAMEN;
wrmsr(SYSCFG, lo, hi);
rdmsr(SYSCFG, lo, hi);
printk_spew("SYSCFG IS NOW 0x%x:0x%x\n", hi, lo);
}