2 * This file is part of the coreboot project.
4 * Copyright (C) 2008-2009 coresystems GmbH
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License as
8 * published by the Free Software Foundation; version 2 of
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
23 #include <device/device.h>
24 #include <device/pci.h>
25 #include <console/console.h>
27 #include <cpu/x86/cache.h>
28 #include <cpu/x86/smm.h>
32 extern unsigned char smm[];
33 extern unsigned int smm_len;
37 #define D_OPEN (1 << 6)
38 #define D_CLS (1 << 5)
39 #define D_LCK (1 << 4)
40 #define G_SMRAME (1 << 3)
41 #define C_BASE_SEG ((0 << 2) | (1 << 1) | (0 << 0))
43 /* While we read PMBASE dynamically in case it changed, let's
44 * initialize it with a sane value
46 static u16 pmbase = DEFAULT_PMBASE;
49 * @brief read and clear PM1_STS
50 * @return PM1_STS register
52 static u16 reset_pm1_status(void)
56 reg16 = inw(pmbase + PM1_STS);
57 /* set status bits are cleared by writing 1 to them */
58 outw(reg16, pmbase + PM1_STS);
63 static void dump_pm1_status(u16 pm1_sts)
65 printk_debug("PM1_STS: ");
66 if (pm1_sts & (1 << 15)) printk_debug("WAK ");
67 if (pm1_sts & (1 << 14)) printk_debug("PCIEXPWAK ");
68 if (pm1_sts & (1 << 11)) printk_debug("PRBTNOR ");
69 if (pm1_sts & (1 << 10)) printk_debug("RTC ");
70 if (pm1_sts & (1 << 8)) printk_debug("PWRBTN ");
71 if (pm1_sts & (1 << 5)) printk_debug("GBL ");
72 if (pm1_sts & (1 << 4)) printk_debug("BM ");
73 if (pm1_sts & (1 << 0)) printk_debug("TMROF ");
78 * @brief read and clear SMI_STS
79 * @return SMI_STS register
81 static u32 reset_smi_status(void)
85 reg32 = inl(pmbase + SMI_STS);
86 /* set status bits are cleared by writing 1 to them */
87 outl(reg32, pmbase + SMI_STS);
92 static void dump_smi_status(u32 smi_sts)
94 printk_debug("SMI_STS: ");
95 if (smi_sts & (1 << 26)) printk_debug("SPI ");
96 if (smi_sts & (1 << 25)) printk_debug("EL_SMI ");
97 if (smi_sts & (1 << 21)) printk_debug("MONITOR ");
98 if (smi_sts & (1 << 20)) printk_debug("PCI_EXP_SMI ");
99 if (smi_sts & (1 << 18)) printk_debug("INTEL_USB2 ");
100 if (smi_sts & (1 << 17)) printk_debug("LEGACY_USB2 ");
101 if (smi_sts & (1 << 16)) printk_debug("SMBUS_SMI ");
102 if (smi_sts & (1 << 15)) printk_debug("SERIRQ_SMI ");
103 if (smi_sts & (1 << 14)) printk_debug("PERIODIC ");
104 if (smi_sts & (1 << 13)) printk_debug("TCO ");
105 if (smi_sts & (1 << 12)) printk_debug("DEVMON ");
106 if (smi_sts & (1 << 11)) printk_debug("MCSMI ");
107 if (smi_sts & (1 << 10)) printk_debug("GPI ");
108 if (smi_sts & (1 << 9)) printk_debug("GPE0 ");
109 if (smi_sts & (1 << 8)) printk_debug("PM1 ");
110 if (smi_sts & (1 << 6)) printk_debug("SWSMI_TMR ");
111 if (smi_sts & (1 << 5)) printk_debug("APM ");
112 if (smi_sts & (1 << 4)) printk_debug("SLP_SMI ");
113 if (smi_sts & (1 << 3)) printk_debug("LEGACY_USB ");
114 if (smi_sts & (1 << 2)) printk_debug("BIOS ");
120 * @brief read and clear GPE0_STS
121 * @return GPE0_STS register
123 static u32 reset_gpe0_status(void)
127 reg32 = inl(pmbase + GPE0_STS);
128 /* set status bits are cleared by writing 1 to them */
129 outl(reg32, pmbase + GPE0_STS);
134 static void dump_gpe0_status(u32 gpe0_sts)
137 printk_debug("GPE0_STS: ");
138 for (i=31; i<= 16; i--) {
139 if (gpe0_sts & (1 << i)) printk_debug("GPIO%d ", (i-16));
141 if (gpe0_sts & (1 << 14)) printk_debug("USB4 ");
142 if (gpe0_sts & (1 << 13)) printk_debug("PME_B0 ");
143 if (gpe0_sts & (1 << 12)) printk_debug("USB3 ");
144 if (gpe0_sts & (1 << 11)) printk_debug("PME ");
145 if (gpe0_sts & (1 << 10)) printk_debug("EL_SCI/BATLOW ");
146 if (gpe0_sts & (1 << 9)) printk_debug("PCI_EXP ");
147 if (gpe0_sts & (1 << 8)) printk_debug("RI ");
148 if (gpe0_sts & (1 << 7)) printk_debug("SMB_WAK ");
149 if (gpe0_sts & (1 << 6)) printk_debug("TCO_SCI ");
150 if (gpe0_sts & (1 << 5)) printk_debug("AC97 ");
151 if (gpe0_sts & (1 << 4)) printk_debug("USB2 ");
152 if (gpe0_sts & (1 << 3)) printk_debug("USB1 ");
153 if (gpe0_sts & (1 << 2)) printk_debug("HOT_PLUG ");
154 if (gpe0_sts & (1 << 0)) printk_debug("THRM ");
159 * @brief read and clear TCOx_STS
160 * @return TCOx_STS registers
162 static u32 reset_tco_status(void)
164 u32 tcobase = pmbase + 0x60;
167 reg32 = inl(tcobase + 0x04);
168 /* set status bits are cleared by writing 1 to them */
169 outl(reg32 & ~(1<<18), tcobase + 0x04); // Don't clear BOOT_STS before SECOND_TO_STS
170 if (reg32 & (1 << 18))
171 outl(reg32 & (1<<18), tcobase + 0x04); // clear BOOT_STS
177 static void dump_tco_status(u32 tco_sts)
179 printk_debug("TCO_STS: ");
180 if (tco_sts & (1 << 20)) printk_debug("SMLINK_SLV ");
181 if (tco_sts & (1 << 18)) printk_debug("BOOT ");
182 if (tco_sts & (1 << 17)) printk_debug("SECOND_TO ");
183 if (tco_sts & (1 << 16)) printk_debug("INTRD_DET ");
184 if (tco_sts & (1 << 12)) printk_debug("DMISERR ");
185 if (tco_sts & (1 << 10)) printk_debug("DMISMI ");
186 if (tco_sts & (1 << 9)) printk_debug("DMISCI ");
187 if (tco_sts & (1 << 8)) printk_debug("BIOSWR ");
188 if (tco_sts & (1 << 7)) printk_debug("NEWCENTURY ");
189 if (tco_sts & (1 << 3)) printk_debug("TIMEOUT ");
190 if (tco_sts & (1 << 2)) printk_debug("TCO_INT ");
191 if (tco_sts & (1 << 1)) printk_debug("SW_TCO ");
192 if (tco_sts & (1 << 0)) printk_debug("NMI2SMI ");
199 * @brief Set the EOS bit
201 static void smi_set_eos(void)
205 reg8 = inb(pmbase + SMI_EN);
207 outb(reg8, pmbase + SMI_EN);
210 extern uint8_t smm_relocation_start, smm_relocation_end;
212 void smm_relocate(void)
216 printk_debug("Initializing SMM handler...");
218 pmbase = pci_read_config16(dev_find_slot(0, PCI_DEVFN(0x1f, 0)), 0x40) & 0xfffc;
219 printk_spew(" ... pmbase = 0x%04x\n", pmbase);
221 smi_en = inl(pmbase + SMI_EN);
222 if (smi_en & APMC_EN) {
223 printk_info("SMI# handler already enabled?\n");
227 /* copy the SMM relocation code */
228 memcpy((void *)0x38000, &smm_relocation_start,
229 &smm_relocation_end - &smm_relocation_start);
232 dump_smi_status(reset_smi_status());
233 dump_pm1_status(reset_pm1_status());
234 dump_gpe0_status(reset_gpe0_status());
235 dump_tco_status(reset_tco_status());
237 /* Enable SMI generation:
239 * - on APMC writes (io 0xb2)
240 * - on writes to SLP_EN (sleep states)
241 * - on writes to GBL_RLS (bios commands)
243 * - on microcontroller writes (io 0x62/0x66)
246 smi_en = 0; /* reset SMI enables */
249 #if DEBUG_PERIODIC_SMIS
250 /* Set DEBUG_PERIODIC_SMIS in i82801gx.h to debug using
253 smi_en |= PERIODIC_EN;
255 smi_en |= SLP_SMI_EN;
258 /* The following need to be on for SMIs to happen */
259 smi_en |= EOS | GBL_SMI_EN;
261 outl(smi_en, pmbase + SMI_EN);
264 * There are several methods of raising a controlled SMI# via
265 * software, among them:
266 * - Writes to io 0xb2 (APMC)
267 * - Writes to the Local Apic ICR with Delivery mode SMI.
269 * Using the local apic is a bit more tricky. According to
270 * AMD Family 11 Processor BKDG no destination shorthand must be
272 * The whole SMM initialization is quite a bit hardware specific, so
273 * I'm not too worried about the better of the methods at the moment
276 /* raise an SMI interrupt */
277 printk_spew(" ... raise SMI#\n");
281 void smm_install(void)
283 /* enable the SMM memory window */
284 pci_write_config8(dev_find_slot(0, PCI_DEVFN(0, 0)), SMRAM,
285 D_OPEN | G_SMRAME | C_BASE_SEG);
287 /* copy the real SMM handler */
288 memcpy((void *)0xa0000, smm, smm_len);
291 /* close the SMM memory window and enable normal SMM */
292 pci_write_config8(dev_find_slot(0, PCI_DEVFN(0, 0)), SMRAM,
293 G_SMRAME | C_BASE_SEG);
298 // FIXME is this a race condition?
302 // We're done. Make sure SMIs can happen!
308 /* LOCK the SMM memory window and enable normal SMM.
309 * After running this function, only a full reset can
310 * make the SMM registers writable again.
312 printk_debug("Locking SMM.\n");
313 pci_write_config8(dev_find_slot(0, PCI_DEVFN(0, 0)), SMRAM,
314 D_LCK | G_SMRAME | C_BASE_SEG);
317 void smm_setup_structures(void *gnvs, void *tcg, void *smi1)
319 /* The GDT or coreboot table is going to live here. But a long time
320 * after we relocated the GNVS, so this is not troublesome.
322 *(u32 *)0x500 = (u32)gnvs;
323 *(u32 *)0x504 = (u32)tcg;
324 *(u32 *)0x508 = (u32)smi1;