From fcd5ace00b333ce31b11b02a2243dfbf39307f10 Mon Sep 17 00:00:00 2001
From: Eric Biederman <ebiederm@xmission.com>
Date: Thu, 14 Oct 2004 19:29:29 +0000
Subject: - Add new cvs code to cvs

git-svn-id: svn://svn.coreboot.org/coreboot/trunk@1657 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1
---
 src/cpu/amd/mtrr/amd_mtrr.c | 85 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 85 insertions(+)
 create mode 100644 src/cpu/amd/mtrr/amd_mtrr.c

(limited to 'src/cpu/amd/mtrr/amd_mtrr.c')

diff --git a/src/cpu/amd/mtrr/amd_mtrr.c b/src/cpu/amd/mtrr/amd_mtrr.c
new file mode 100644
index 0000000000..7c8d50ae68
--- /dev/null
+++ b/src/cpu/amd/mtrr/amd_mtrr.c
@@ -0,0 +1,85 @@
+#include <console/console.h>
+#include <device/device.h>
+#include <cpu/x86/mtrr.h>
+#include <cpu/amd/mtrr.h>
+#include <cpu/x86/cache.h>
+#include <cpu/x86/msr.h>
+
+static unsigned long resk(uint64_t value) 
+{
+	unsigned long resultk;
+	if (value < (1ULL << 42)) {
+		resultk = value >> 10;
+	}
+	else {
+		resultk = 0xffffffff;
+	}
+	return resultk;
+}
+
+void amd_setup_mtrrs(void)
+{
+	unsigned long mmio_basek, tomk;
+	unsigned long i;
+	device_t dev;
+	msr_t msr;
+
+	x86_setup_mtrrs();
+
+	/* Except for the PCI MMIO hole just before 4GB there are no
+	 * significant holes in the address space, so just account
+	 * for those two and move on.
+	 */
+	mmio_basek = tomk = 0;
+	for(dev = all_devices; dev; dev = dev->next) {
+		struct resource *res, *last;
+		last = &dev->resource[dev->resources];
+		for(res = &dev->resource[0]; res < last; res++) {
+			unsigned long topk;
+			if (!(res->flags & IORESOURCE_MEM) ||
+				(!(res->flags & IORESOURCE_CACHEABLE))) {
+				continue;
+			}
+			topk = resk(res->base + res->size);
+			if (tomk < topk) {
+				tomk = topk;
+			}
+			if ((topk < 4*1024*1024) && (mmio_basek < topk)) {
+				mmio_basek = topk;
+			}
+		}
+	}
+	if (mmio_basek > tomk) {
+		mmio_basek = tomk;
+	}
+	/* Round mmio_basek down to the nearst size that will fit in TOP_MEM */
+	mmio_basek = mmio_basek & ~TOP_MEM_MASK_KB;
+	/* Round tomk up to the next greater size that will fit in TOP_MEM */
+	tomk = (tomk + TOP_MEM_MASK_KB) & ~TOP_MEM_MASK_KB;
+
+	disable_cache();
+
+	/* Setup TOP_MEM */
+	msr.hi = mmio_basek >> 22;
+	msr.lo = mmio_basek << 10;
+	wrmsr(TOP_MEM, msr);
+
+	/* Setup TOP_MEM2 */
+	msr.hi = tomk >> 22;
+	msr.lo = tomk << 10;
+	wrmsr(TOP_MEM2, msr);
+
+	/* zero the IORR's before we enable to prevent
+	 * undefined side effects.
+	 */
+	msr.lo = msr.hi = 0;
+	for(i = IORR_FIRST; i <= IORR_LAST; i++) {
+		wrmsr(i, msr);
+	}
+
+	msr = rdmsr(SYSCFG_MSR);
+	msr.lo |= SYSCFG_MSR_MtrrVarDramEn | SYSCFG_MSR_TOM2En;
+	wrmsr(SYSCFG_MSR, msr);
+
+	enable_cache();
+}
-- 
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