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add NC support to spare mtrrs for 64G memory stored 

git-svn-id: svn://svn.coreboot.org/coreboot/trunk@1843 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1
This commit is contained in:
Yinghai Lu 2005-01-06 04:55:19 +00:00
parent 1bc5654957
commit 953e0f6afe
1 changed files with 36 additions and 4 deletions
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40
src/cpu/x86/mtrr/mtrr.c
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@ -22,7 +22,9 @@
*
* Reference: Intel Architecture Software Developer's Manual, Volume 3: System Programming
*/
/*
2005.1 yhlu add NC support to spare mtrrs for 64G memory stored
*/
#include <stddef.h>
#include <console/console.h>
#include <device/device.h>
@ -31,7 +33,11 @@
#include <cpu/x86/cache.h>
#warning "FIXME I do not properly handle address more than 36 physical address bits"
#ifdef k8
//#define k8 0
#define k8 1
#if k8
# define ADDRESS_BITS 40
#else
# define ADDRESS_BITS 36
@ -218,6 +224,31 @@ static unsigned int range_to_mtrr(unsigned int reg,
if (!range_sizek || (reg >= BIOS_MTRRS)) {
return reg;
}
if(next_range_startk == 4096*1024) {// There is a hole below 4G, We need to use UC to spare mtrr
unsigned long sizek;
sizek = 4096*1024;
printk_debug("Setting variable MTRR %d, base: %4dMB, range: %4dMB, type WB\n",
reg, range_startk >>10, sizek >> 10);
set_var_mtrr(reg++, range_startk, sizek, MTRR_TYPE_WRBACK);
while(range_sizek) {
unsigned long max_align, align;
/* Compute the maximum size I can make a range */
max_align = fls(range_startk);
align = fms(range_sizek);
if (align > max_align) {
align = max_align;
}
sizek = 1 << align;
range_startk += sizek;
range_sizek -= sizek;
}
range_startk = 4096*1024 - sizek;
printk_debug("Setting variable MTRR %d, base: %4dMB, range: %4dMB, type NC\n",
reg, range_startk >>10, sizek >> 10);
set_var_mtrr(reg++, range_startk, sizek, MTRR_TYPE_UNCACHEABLE);
return reg;
}
while(range_sizek) {
unsigned long max_align, align;
unsigned long sizek;
@ -306,7 +337,7 @@ void x86_setup_mtrrs(void)
* and clear out the mtrrs.
*/
struct var_mtrr_state var_state;
#if !k8
printk_debug("\n");
/* Initialized the fixed_mtrrs to uncached */
printk_debug("Setting fixed MTRRs(%d-%d) type: UC\n",
@ -319,6 +350,7 @@ void x86_setup_mtrrs(void)
IORESOURCE_MEM | IORESOURCE_CACHEABLE, IORESOURCE_MEM | IORESOURCE_CACHEABLE,
set_fixed_mtrr_resource, NULL);
printk_debug("DONE fixed MTRRs\n");
#endif
/* Cache as many memory areas as possible */
/* FIXME is there an algorithm for computing the optimal set of mtrrs?
@ -330,7 +362,7 @@ void x86_setup_mtrrs(void)
search_global_resources(
IORESOURCE_MEM | IORESOURCE_CACHEABLE, IORESOURCE_MEM | IORESOURCE_CACHEABLE,
set_var_mtrr_resource, &var_state);
last_msr:
/* Write the last range */
var_state.reg = range_to_mtrr(var_state.reg, var_state.range_startk, var_state.range_sizek, 0);
printk_debug("DONE variable MTRRs\n");