Split smm-open-ich2 into two files:

[netwatch.git] / ich2 / smram-ich2.c

diff --git a/ich2/smram-ich2.c b/ich2/smram-ich2.c
new file mode 100644 (file)
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;
+}