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-rw-r--r--src/northbridge/intel/i945/i945.h1
-rw-r--r--src/northbridge/intel/i945/northbridge.c35
-rw-r--r--src/northbridge/intel/i945/ram_calc.c38
3 files changed, 29 insertions, 45 deletions
diff --git a/src/northbridge/intel/i945/i945.h b/src/northbridge/intel/i945/i945.h
index 5929a1d01c..cc5f08791f 100644
--- a/src/northbridge/intel/i945/i945.h
+++ b/src/northbridge/intel/i945/i945.h
@@ -365,6 +365,7 @@ void dump_spd_registers(void);
void dump_mem(unsigned int start, unsigned int end);
u32 decode_igd_memory_size(u32 gms);
+u32 decode_tseg_size(const u8 esmramc);
#endif /* __ACPI__ */
diff --git a/src/northbridge/intel/i945/northbridge.c b/src/northbridge/intel/i945/northbridge.c
index eb8e321f31..b8a225562b 100644
--- a/src/northbridge/intel/i945/northbridge.c
+++ b/src/northbridge/intel/i945/northbridge.c
@@ -59,8 +59,8 @@ static int get_pcie_bar(u32 *base)
static void pci_domain_set_resources(struct device *dev)
{
- uint32_t pci_tolm;
- uint8_t tolud, reg8;
+ uint32_t pci_tolm, tseg_sizek;
+ uint8_t tolud;
uint16_t reg16;
unsigned long long tomk, tomk_stolen;
uint64_t uma_memory_base = 0, uma_memory_size = 0;
@@ -95,31 +95,12 @@ static void pci_domain_set_resources(struct device *dev)
uma_memory_size = uma_size * 1024ULL;
}
- reg8 = pci_read_config8(dev_find_slot(0, PCI_DEVFN(0, 0)), ESMRAMC);
- if (reg8 & 1) {
- int tseg_size = 0;
- printk(BIOS_DEBUG, "TSEG decoded, subtracting ");
- reg8 >>= 1;
- reg8 &= 3;
- switch (reg8) {
- case 0:
- tseg_size = 1024;
- break; /* TSEG = 1M */
- case 1:
- tseg_size = 2048;
- break; /* TSEG = 2M */
- case 2:
- tseg_size = 8192;
- break; /* TSEG = 8M */
- }
-
- printk(BIOS_DEBUG, "%dM\n", tseg_size >> 10);
- tomk_stolen -= tseg_size;
-
- /* For reserving TSEG memory in the memory map */
- tseg_memory_base = tomk_stolen * 1024ULL;
- tseg_memory_size = tseg_size * 1024ULL;
- }
+ tseg_sizek = decode_tseg_size(pci_read_config8(dev_find_slot(0,
+ PCI_DEVFN(0, 0)), ESMRAMC)) >> 10;
+ printk(BIOS_DEBUG, "TSEG decoded, subtracting %dM\n", tseg_sizek >> 10);
+ tomk_stolen -= tseg_sizek;
+ tseg_memory_base = tomk_stolen * 1024ULL;
+ tseg_memory_size = tseg_sizek * 1024ULL;
/* The following needs to be 2 lines, otherwise the second
* number is always 0
diff --git a/src/northbridge/intel/i945/ram_calc.c b/src/northbridge/intel/i945/ram_calc.c
index a106d117f2..15ba7f4527 100644
--- a/src/northbridge/intel/i945/ram_calc.c
+++ b/src/northbridge/intel/i945/ram_calc.c
@@ -25,6 +25,24 @@
#include <cpu/x86/mtrr.h>
#include <program_loading.h>
+/* Decodes TSEG region size to bytes. */
+u32 decode_tseg_size(const u8 esmramc)
+{
+ if (!(esmramc & 1))
+ return 0;
+ switch ((esmramc >> 1) & 3) {
+ case 0:
+ return 1 << 20;
+ case 1:
+ return 2 << 20;
+ case 2:
+ return 8 << 20;
+ case 3:
+ default:
+ die("Bad TSEG setting.\n");
+ }
+}
+
static uintptr_t smm_region_start(void)
{
uintptr_t tom;
@@ -35,24 +53,8 @@ static uintptr_t smm_region_start(void)
else
tom = (pci_read_config8(PCI_DEV(0, 0, 0), TOLUD) & 0xf7) << 24;
- /* if TSEG enabled subtract size */
- switch (pci_read_config8(PCI_DEV(0, 0, 0), ESMRAMC) & 0x07) {
- case 0x01:
- /* 1MB TSEG */
- tom -= 0x100000;
- break;
- case 0x03:
- /* 2MB TSEG */
- tom -= 0x200000;
- break;
- case 0x05:
- /* 8MB TSEG */
- tom -= 0x800000;
- break;
- default:
- /* TSEG either disabled or invalid */
- break;
- }
+ /* subsctract TSEG size */
+ tom -= decode_tseg_size(pci_read_config8(PCI_DEV(0, 0, 0), ESMRAMC));
return tom;
}