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authorH. Peter Anvin <hpa@zytor.com>2008-01-22 23:16:32 -0800
committerH. Peter Anvin <hpa@zytor.com>2008-01-22 23:16:32 -0800
commit6ae24916aca569363cb9808ee5866ec536b96c64 (patch)
tree21fd3fe562f90b76075e67f316af55cb0a1b5895 /com32/modules/meminfo.c
parente9efa3b65caa4a52b8b42b59f5faa1d14572f29d (diff)
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meminfo.c32: a program to dump out the system memory map
Handy little utility for dumping out the system memory map. Changes no other code.
Diffstat (limited to 'com32/modules/meminfo.c')
-rw-r--r--com32/modules/meminfo.c109
1 files changed, 109 insertions, 0 deletions
diff --git a/com32/modules/meminfo.c b/com32/modules/meminfo.c
new file mode 100644
index 00000000..81678c5c
--- /dev/null
+++ b/com32/modules/meminfo.c
@@ -0,0 +1,109 @@
+/* ----------------------------------------------------------------------- *
+ *
+ * Copyright 2008 H. Peter Anvin - All Rights Reserved
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
+ * Boston MA 02110-1301, USA; either version 2 of the License, or
+ * (at your option) any later version; incorporated herein by reference.
+ *
+ * ----------------------------------------------------------------------- */
+
+/*
+ * meminfo.c
+ *
+ * Dump the memory map of the system
+ */
+#include <inttypes.h>
+#include <stdio.h>
+#include <string.h>
+#include <console.h>
+#include <com32.h>
+
+struct e820_data {
+ uint64_t base;
+ uint64_t len;
+ uint32_t type;
+} __attribute__((packed));
+
+static const char * const e820_types[] = {
+ "usable",
+ "reserved",
+ "ACPI reclaim",
+ "ACPI NVS",
+};
+
+static void dump_e820(void)
+{
+ com32sys_t ireg, oreg;
+ struct e820_data ed;
+ uint32_t type;
+
+ memset(&ireg, 0, sizeof ireg);
+
+ ireg.eax.w[0] = 0xe820;
+ ireg.edx.l = 0x534d4150;
+ ireg.ecx.l = sizeof(struct e820_data);
+ ireg.edi.w[0] = OFFS(__com32.cs_bounce);
+ ireg.es = SEG(__com32.cs_bounce);
+
+ do {
+ __intcall(0x15, &ireg, &oreg);
+ if (oreg.eflags.l & EFLAGS_CF ||
+ oreg.eax.l != 0x534d4150)
+ break;
+
+ memcpy(&ed, __com32.cs_bounce, sizeof ed);
+
+ /* ebx base length end type */
+ printf("%8x %016llx %016llx %016llx %x",
+ ireg.ebx.l, ed.base, ed.len, ed.base+ed.len, ed.type);
+
+ type = ed.type - 1;
+ if (type < sizeof(e820_types)/sizeof(e820_types[0]))
+ printf(" %s", e820_types[type]);
+
+ putchar('\n');
+
+ ireg.ebx.l = oreg.ebx.l;
+ } while (ireg.ebx.l);
+}
+
+static void dump_legacy(void)
+{
+ com32sys_t ireg, oreg;
+ uint16_t dosram = *(uint16_t *)0x413;
+ struct { uint16_t offs, seg; } * const ivt = (void *)0;
+
+ memset(&ireg, 0, sizeof ireg);
+
+ __intcall(0x12, &ireg, &oreg);
+
+ printf("INT 15h = %04x:%04x DOS RAM: %dK (0x%05x) INT 12h: %dK (0x%05x)\n",
+ ivt[0x15].seg, ivt[0x15].offs,
+ dosram, dosram << 10,
+ oreg.eax.w[0], oreg.eax.w[0] << 10);
+
+ ireg.eax.b[1] = 0x88;
+ __intcall(0x15, &ireg, &oreg);
+
+ printf("INT 15 88: 0x%04x (%uK) ",
+ oreg.eax.w[0], oreg.eax.w[0]);
+
+ ireg.eax.w[0] = 0xe801;
+ __intcall(0x15, &ireg, &oreg);
+
+ printf("INT 15 E801: 0x%04x (%uK) 0x%04x (%uK)\n",
+ oreg.ecx.w[0], oreg.ecx.w[0], oreg.edx.w[0], oreg.edx.w[0] << 6);
+}
+
+int main(void)
+{
+ openconsole(&dev_null_r, &dev_stdcon_w);
+
+ dump_legacy();
+ dump_e820();
+
+ return 0;
+}