2 * SMRAM access utility for ICH2 chipset
3 * NetWatch system management mode administration console
5 * Copyright (c) 2008 Jacob Potter and Joshua Wise. All rights reserved.
6 * This program is free software; you can redistribute and/or modify it under
7 * the terms found in the file LICENSE in the root of this source tree.
12 #include "reg-82815.h"
16 static unsigned long memsz[] = {
35 unsigned int smram_tseg_length(void) {
39 smramc = pci_read8(0, 0, 0, SMRAMC);
41 usmm = (smramc >> 4) & 0x3;
57 void * smram_tseg_start(void) {
58 unsigned char drp, drp2;
61 drp = pci_read8(0, 0, 0, DRP);
62 drp2 = pci_read8(0, 0, 0, DRP2);
64 tom += memsz[drp & 0xF];
65 tom += memsz[drp >> 4];
66 tom += memsz[drp2 & 0xF];
68 return (void *)(tom - smram_tseg_length());
73 void smram_aseg_dump(void) {
75 unsigned char smramc, drp, drp2;
79 smramc = pci_read8(0, 0, 0, SMRAMC);
80 drp = pci_read8(0, 0, 0, DRP);
81 drp2 = pci_read8(0, 0, 0, DRP2);
83 printf("SMRAMC: %02x\n", smramc);
85 tom += memsz[drp & 0xF];
86 tom += memsz[drp >> 4];
87 tom += memsz[drp2 & 0xF];
89 printf("Top of DRAM: %08x\n", tom);
91 usmm = (smramc >> 4) & 0x3;
92 lsmm = (smramc >> 2) & 0x3;
97 printf("TSEG and HSEG both off\n");
100 printf("TSEG off, HSEG %s\n", lsmm ? "off" : "on");
103 printf("TSEG 512KB (%08x - %08x), HSEG %s\n",
104 tom - 512 * 1024, tom - 1, lsmm ? "off" : "on");
107 printf("TSEG 1MB (%08x - %08x), HSEG %s\n",
108 tom - 1 * 1024 * 1024, tom - 1, lsmm ? "off" : "on");
115 printf("ABSEG disabled\n");
118 printf("ABSEG enabled as system RAM\n");
121 printf("ABSEG enabled for SMM code only\n");
124 printf("ABSEG enabled for both SMM code and data\n");
132 unsigned char smramc = pci_read8(0, 0, 0, SMRAMC);
134 return (smramc & SMRAMC_LOCK) ? 1 : 0;
137 smram_state_t smram_save_state()
139 return pci_read8(0, 0, 0, SMRAMC);
142 void smram_restore_state(smram_state_t state)
144 pci_write8(0, 0, 0, SMRAMC, state);
147 int smram_aseg_set_state (int open) {
148 unsigned char smramc;
153 smramc = pci_read8(0, 0, 0, SMRAMC);
157 case SMRAM_ASEG_CLOSED:
158 smramc = (smramc & 0xF0) | 0x00;
160 case SMRAM_ASEG_OPEN:
161 smramc = (smramc & 0xF0) | 0x04;
163 case SMRAM_ASEG_SMMCODE:
164 smramc = (smramc & 0xF0) | 0x08;
166 case SMRAM_ASEG_SMMONLY:
167 smramc = (smramc & 0xF0) | 0x0C;
173 pci_write8(0, 0, 0, SMRAMC, smramc);
178 int smram_tseg_set_state (int open) {
179 unsigned char smramc;
184 smramc = pci_read8(0, 0, 0, SMRAMC);
188 case SMRAM_TSEG_OPEN:
189 smramc = (smramc & 0x8F) | 0x00;
195 pci_write8(0, 0, 0, SMRAMC, smramc);