- Initial checkin of the freebios2 tree

git-svn-id: svn://svn.coreboot.org/coreboot/trunk@784 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1

1 files changed, 59 insertions, 0 deletions

diff --git a/src/cpu/k8/cpufixup.c b/src/cpu/k8/cpufixup.c
new file mode 100644
index 0000000000..9f306d1156
--- /dev/null
+++ b/src/cpu/k8/cpufixup.c
@@ -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);
+}
+