diff options
Diffstat (limited to 'src/cpu/x86/mtrr')
| -rw-r--r-- | src/cpu/x86/mtrr/mtrr.c | 40 |
1 files changed, 36 insertions, 4 deletions
diff --git a/src/cpu/x86/mtrr/mtrr.c b/src/cpu/x86/mtrr/mtrr.c index dcf9f008e2..5cc09e3980 100644 --- a/src/cpu/x86/mtrr/mtrr.c +++ b/src/cpu/x86/mtrr/mtrr.c @@ -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"); |