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spare one more mtrr 

git-svn-id: svn://svn.coreboot.org/coreboot/trunk@1903 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1
This commit is contained in:
Yinghai Lu 2005-01-27 22:48:12 +00:00
parent 830435bb16
commit 6360187e9e
1 changed files with 24 additions and 31 deletions
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55
src/cpu/x86/mtrr/mtrr.c
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@ -219,36 +219,11 @@ static unsigned fixed_mtrr_index(unsigned long addrk)
static unsigned int range_to_mtrr(unsigned int reg, static unsigned int range_to_mtrr(unsigned int reg,
unsigned long range_startk, unsigned long range_sizek, unsigned long range_startk, unsigned long range_sizek,
unsigned long next_range_startk) unsigned long next_range_startk, unsigned char type)
{ {
if (!range_sizek || (reg >= BIOS_MTRRS)) { if (!range_sizek || (reg >= BIOS_MTRRS)) {
return reg; 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) { while(range_sizek) {
unsigned long max_align, align; unsigned long max_align, align;
unsigned long sizek; unsigned long sizek;
@ -259,9 +234,12 @@ static unsigned int range_to_mtrr(unsigned int reg,
align = max_align; align = max_align;
} }
sizek = 1 << align; sizek = 1 << align;
printk_debug("Setting variable MTRR %d, base: %4dMB, range: %4dMB, type WB\n", printk_debug("Setting variable MTRR %d, base: %4dMB, range: %4dMB, type %s\n",
reg, range_startk >>10, sizek >> 10); reg, range_startk >>10, sizek >> 10,
set_var_mtrr(reg++, range_startk, sizek, MTRR_TYPE_WRBACK); (type==MTRR_TYPE_UNCACHEABLE)?"NC":
((type==MTRR_TYPE_WRBACK)?"WB":"Other")
);
set_var_mtrr(reg++, range_startk, sizek, type);
range_startk += sizek; range_startk += sizek;
range_sizek -= sizek; range_sizek -= sizek;
if (reg >= BIOS_MTRRS) if (reg >= BIOS_MTRRS)
@ -300,6 +278,7 @@ static void set_fixed_mtrr_resource(void *gp, struct device *dev, struct resourc
struct var_mtrr_state { struct var_mtrr_state {
unsigned long range_startk, range_sizek; unsigned long range_startk, range_sizek;
unsigned int reg; unsigned int reg;
unsigned long hole_startk, hole_sizek;
}; };
void set_var_mtrr_resource(void *gp, struct device *dev, struct resource *res) void set_var_mtrr_resource(void *gp, struct device *dev, struct resource *res)
@ -321,9 +300,20 @@ void set_var_mtrr_resource(void *gp, struct device *dev, struct resource *res)
} }
/* Write the range mtrrs */ /* Write the range mtrrs */
if (state->range_sizek != 0) { if (state->range_sizek != 0) {
state->reg = range_to_mtrr(state->reg, state->range_startk, state->range_sizek, basek); if(state->hole_sizek == 0) {
// we need to put that on to hole.
unsigned long endk = basek + sizek;
state->hole_startk = state->range_startk + state->range_sizek;
state->hole_sizek = basek - state->hole_startk;
state->range_sizek = endk - state->range_startk;
return;
}
state->reg = range_to_mtrr(state->reg, state->range_startk, state->range_sizek, basek, MTRR_TYPE_WRBACK);
state->reg = range_to_mtrr(state->reg, state->hole_startk, state->hole_sizek, basek, MTRR_TYPE_UNCACHEABLE);
state->range_startk = 0; state->range_startk = 0;
state->range_sizek = 0; state->range_sizek = 0;
state->hole_startk = 0;
state->hole_sizek = 0;
} }
/* Allocate an msr */ /* Allocate an msr */
state->range_startk = basek; state->range_startk = basek;
@ -358,13 +348,16 @@ void x86_setup_mtrrs(void)
*/ */
var_state.range_startk = 0; var_state.range_startk = 0;
var_state.range_sizek = 0; var_state.range_sizek = 0;
var_state.hole_startk = 0;
var_state.hole_sizek = 0;
var_state.reg = 0; var_state.reg = 0;
search_global_resources( search_global_resources(
IORESOURCE_MEM | IORESOURCE_CACHEABLE, IORESOURCE_MEM | IORESOURCE_CACHEABLE, IORESOURCE_MEM | IORESOURCE_CACHEABLE, IORESOURCE_MEM | IORESOURCE_CACHEABLE,
set_var_mtrr_resource, &var_state); set_var_mtrr_resource, &var_state);
/* Write the last range */ /* Write the last range */
var_state.reg = range_to_mtrr(var_state.reg, var_state.range_startk, var_state.range_sizek, 0); var_state.reg = range_to_mtrr(var_state.reg, var_state.range_startk, var_state.range_sizek, 0, MTRR_TYPE_WRBACK);
var_state.reg = range_to_mtrr(var_state.reg, var_state.hole_startk, var_state.hole_sizek, 0, MTRR_TYPE_UNCACHEABLE);
printk_debug("DONE variable MTRRs\n"); printk_debug("DONE variable MTRRs\n");
printk_debug("Clear out the extra MTRR's\n"); printk_debug("Clear out the extra MTRR's\n");
/* Clear out the extra MTRR's */ /* Clear out the extra MTRR's */