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/x86/pae/Config.lb |  1 +
 src/cpu/x86/pae/pgtbl.c   | 94 +++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 95 insertions(+)
 create mode 100644 src/cpu/x86/pae/Config.lb
 create mode 100644 src/cpu/x86/pae/pgtbl.c

(limited to 'src/cpu/x86/pae')

diff --git a/src/cpu/x86/pae/Config.lb b/src/cpu/x86/pae/Config.lb
new file mode 100644
index 0000000000..45e7f5754b
--- /dev/null
+++ b/src/cpu/x86/pae/Config.lb
@@ -0,0 +1 @@
+object pgtbl.o
\ No newline at end of file
diff --git a/src/cpu/x86/pae/pgtbl.c b/src/cpu/x86/pae/pgtbl.c
new file mode 100644
index 0000000000..756cc53f65
--- /dev/null
+++ b/src/cpu/x86/pae/pgtbl.c
@@ -0,0 +1,94 @@
+#include <console/console.h>
+#include <cpu/cpu.h>
+#include <cpu/x86/pae.h>
+#include <string.h>
+
+static void paging_off(void)
+{
+	__asm__ __volatile__ (
+		/* Disable paging */
+		"movl	%%cr0, %%eax\n\t"
+		"andl	$0x7FFFFFFF, %%eax\n\t"
+		"movl	%%eax, %%cr0\n\t"
+		/* Disable pae */
+		"movl	%%cr4, %%eax\n\t"
+		"andl	$0xFFFFFFDF, %%eax\n\t"
+		:
+		:
+		: "eax"
+		);
+}
+
+static void paging_on(void *pdp)
+{
+	__asm__ __volatile__(
+		/* Load the page table address */
+		"movl	%0, %%cr3\n\t"
+		/* Enable pae */
+		"movl	%%cr4, %%eax\n\t"
+		"orl	$0x00000020, %%eax\n\t"
+		"movl	%%eax, %%cr4\n\t"
+		/* Enable paging */
+		"movl	%%cr0, %%eax\n\t"
+		"orl	$0x80000000, %%eax\n\t"
+		"movl	%%eax, %%cr0\n\t"
+		:
+		: "r" (pdp)
+		: "eax"
+		);
+}
+
+void *map_2M_page(unsigned long page) 
+{
+	struct pde {
+		uint32_t addr_lo;
+		uint32_t addr_hi;
+	} __attribute__ ((packed));
+	struct pg_table {
+		struct pde pd[2048];
+		struct pde pdp[512];
+	} __attribute__ ((packed));
+	static struct pg_table pgtbl[CONFIG_MAX_CPUS] __attribute__ ((aligned(4096)));
+	static unsigned long mapped_window[CONFIG_MAX_CPUS];
+	unsigned long index;
+	unsigned long window;
+	void *result;
+	int i;
+	index = cpu_index();
+	if ((index < 0) || (index >= CONFIG_MAX_CPUS)) {
+		return MAPPING_ERROR;
+	}
+	window = page >> 10;
+	if (window != mapped_window[index]) {
+		paging_off();
+		if (window > 1) {
+			struct pde *pd, *pdp;
+			/* Point the page directory pointers at the page directories */
+			memset(&pgtbl[index].pdp, 0, sizeof(pgtbl[index].pdp));
+			pd = pgtbl[index].pd;
+			pdp = pgtbl[index].pdp;
+			pdp[0].addr_lo = ((uint32_t)&pd[512*0])|1;
+			pdp[1].addr_lo = ((uint32_t)&pd[512*1])|1;
+			pdp[2].addr_lo = ((uint32_t)&pd[512*2])|1;
+			pdp[3].addr_lo = ((uint32_t)&pd[512*3])|1;
+			/* The first half of the page table is identity mapped */
+			for(i = 0; i < 1024; i++) {
+				pd[i].addr_lo = ((i & 0x3ff) << 21)| 0xE3;
+				pd[i].addr_hi = 0;
+			}
+			/* The second half of the page table holds the mapped page */
+			for(i = 1024; i < 2048; i++) {
+				pd[i].addr_lo = ((window & 1) << 31) | ((i & 0x3ff) << 21) | 0xE3;
+				pd[i].addr_hi = (window >> 1);
+			}
+			paging_on(pdp);
+		}
+		mapped_window[index] = window;
+	}
+	if (window == 0) {
+		result = (void *)(page << 21);
+	} else {
+		result = (void *)(0x80000000 | ((page & 0x3ff) << 21));
+	}
+	return result;
+}
-- 
cgit v1.2.3