--- /dev/null
+#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;
+}
--- /dev/null
+#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;
+}