From: Jacob Potter <jdpotter@andrew.cmu.edu>
Date: Fri, 12 Sep 2008 21:55:01 +0000 (-0400)
Subject: Split smm-open-ich2 into two files:
X-Git-Url: http://git.joshuawise.com/netwatch.git/commitdiff_plain/99970893290223f2006c3a0c6f34ab9eaf5cb4c9

Split smm-open-ich2 into two files:

- ich2/smram-ich2.c, smram manipulation functions capable of running on
  Linux or raw (using an appropriate pci-???.c)
- tools/smram-linux-tool.c, replacement for smram-open-ich2 using the
  above driver functions.
---

diff --git a/ich2/smm-open-ich2.c b/ich2/smm-open-ich2.c
index e76fcfc..120ac74 100644
--- a/ich2/smm-open-ich2.c
+++ b/ich2/smm-open-ich2.c
@@ -4,6 +4,12 @@
 #include <stdlib.h>
 #include <stdio.h>
 
+/***********************************************************************
+ * DEPRECATED DEPRECATED DEPRECATED DEPRECATED DEPRECATED
+ *
+ * This should be replaced by ../util/smram-ich2 once it's verified to work properly.
+ */
+
 unsigned long memsz[] = {
 	0,			// 0
 	32*1024*1024,		// 1
diff --git a/ich2/smram-ich2.c b/ich2/smram-ich2.c
new file mode 100644
index 0000000..1052f3b
--- /dev/null
+++ b/ich2/smram-ich2.c
@@ -0,0 +1,102 @@
+#include "reg-82815.h"
+
+unsigned long memsz[] = {
+	0,			// 0
+	32*1024*1024,		// 1
+	32*1024*1024,		// 2
+	48*1024*1024,		// 3
+	64*1024*1024,		// 4
+	64*1024*1024,		// 5
+	96*1024*1024,		// 6
+	128*1024*1024,		// 7
+	128*1024*1024,		// 8
+	128*1024*1024,		// 9
+	128*1024*1024,		// A
+	192*1024*1024,		// B
+	256*1024*1024,		// C
+	256*1024*1024,		// D
+	256*1024*1024,		// E
+	512*1024*1024		// F
+};
+
+#ifdef __linux__
+
+void smram_aseg_dump(void) {
+
+	unsigned char smramc, drp, drp2;
+	unsigned int tom = 0;
+	int usmm, lsmm;
+
+	smramc = pci_read8(0, 0, 0, SMRAMC);
+	drp = pci_read8(0, 0, 0, DRP);
+	drp2 = pci_read8(0, 0, 0, DRP2);
+
+	printf("SMRAMC: %02x\n", smramc);
+
+	tom += memsz[drp & 0xF];
+	tom += memsz[drp >> 4];
+	tom += memsz[drp2 & 0xF];
+	
+	printf("Top of DRAM: %08x\n", tom);
+	
+	usmm = (smramc >> 4) & 0x3;
+	lsmm = (smramc >> 2) & 0x3;
+	
+	switch (usmm)
+	{
+	case 0:
+		printf("TSEG and HSEG both off\n");
+		break;
+	case 1:
+		printf("TSEG off, HSEG %s\n", lsmm ? "off" : "on");
+		break;
+	case 2:
+		printf("TSEG 512KB (%08x - %08x), HSEG %s\n",
+			tom - 512 * 1024, tom - 1, lsmm ? "off" : "on");
+		break;
+	case 3:
+		printf("TSEG 1MB (%08x - %08x), HSEG %s\n",
+			tom - 1 * 1024 * 1024, tom - 1, lsmm ? "off" : "on");
+		break;
+	}
+	
+	switch (lsmm)
+	{
+	case 0:
+		printf("ABSEG disabled\n");
+		break;
+	case 1:
+		printf("ABSEG enabled as system RAM\n");
+		break;
+	case 2:
+		printf("ABSEG enabled for SMM code only\n");
+		break;
+	case 3:
+		printf("ABSEG enabled for both SMM code and data\n");
+		break;
+	}
+}
+#endif
+
+int smram_aseg_set_state (int open) {
+	unsigned char smramc;
+	smramc = pci_read8(0, 0, 0, SMRAMC);
+
+	if (smramc & SMRAMC_LOCK)
+	{
+		/* SMRAM is locked; can't load anything. */
+		return 1;
+	}
+
+	if (open) {
+		/* Set LSMM to 01 (ABseg = system RAM) */
+		smramc = (smramc & 0xF0) | 0x04;
+	} else {
+		/* Set LSMM to 11 (ABseg = SMM RAM) */
+		smramc = (smramc & 0xF0) | 0x0C;
+	}
+
+	pci_write8(0, 0, 0, SMRAMC);
+
+	return 0;
+}
diff --git a/tools/.gitignore b/tools/.gitignore
new file mode 100644
index 0000000..e2ec8c1
--- /dev/null
+++ b/tools/.gitignore
@@ -0,0 +1 @@
+smram-ich2
diff --git a/tools/Makefile b/tools/Makefile
new file mode 100644
index 0000000..35f37d4
--- /dev/null
+++ b/tools/Makefile
@@ -0,0 +1,2 @@
+smram-ich2: smram-linux-tool.c ../pci/pci-linux.c ../ich2/smram-ich2.c 
+	gcc -o smram-ich2 smram-linux-tool.c ../pci/pci-linux.c ../ich2/smram-ich2.c 
diff --git a/tools/smram-linux-tool.c b/tools/smram-linux-tool.c
new file mode 100644
index 0000000..0d47bb4
--- /dev/null
+++ b/tools/smram-linux-tool.c
@@ -0,0 +1,68 @@
+#include <unistd.h>
+#include <getopt.h>
+#include <stdlib.h>
+#include <stdio.h>
+
+static struct option longopts[] = {
+	{ "open",	no_argument,	NULL,	'o'	},
+	{ "close",	no_argument,	NULL,	'c'	},
+	{ "dump",	no_argument,	NULL,	'd'	},
+	{ NULL,		0,		NULL,	0	}
+};
+
+#define OP_DUMP 1
+#define OP_SET 2
+
+void usage(int argc, char **argv)
+{
+	printf("Usage: %s [ --dump ] [ --open | --close ]\n",
+		argv[0]);
+	exit(1);
+}
+
+int main(int argc, char **argv)
+{
+	if (geteuid() != 0)
+	{
+		printf("This program must be run as root, dumbass.\n");
+		return 1;
+	}
+	
+	int ch;
+	int op = 0;
+	int do_open = 0;
+	while ((ch = getopt_long(argc, argv, "ocsd:", longopts, NULL)) != -1)
+	{
+		switch (ch)
+		{
+		case 'o':
+			if (op & OP_SET) usage(argc, argv);
+			op |= OP_SET;
+			do_open = 1;
+			break;
+		case 'c':
+			if (op & OP_SET) usage(argc, argv);
+			op |= OP_SET;
+			break;
+		case 'd':
+			op |= OP_DUMP;
+			break;
+		default:
+			usage(argc, argv);
+		}
+	}
+
+	if (!op) usage(argc, argv);
+
+	if (op & OP_DUMP)
+	{
+		smram_aseg_dump();
+	}
+
+	if (op & OP_SET)
+	{
+		smram_aseg_set_state(do_open);
+	}
+	
+	return 0;
+}