Following patch adds dynamically generated P-States infrastructure as well as
[coreboot.git] / src / arch / i386 / boot / acpigen.c
1 /*
2  * This file is part of the coreboot project.
3  *
4  * Copyright (C) 2009 Rudolf Marek <r.marek@assembler.cz>
5  *
6  * This program is free software; you can redistribute it and/or modify
7  * it under the terms of the GNU General Public License v2 as published by
8  * the Free Software Foundation.
9  *
10  * This program is distributed in the hope that it will be useful,
11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
13  * GNU General Public License for more details.
14  *
15  * You should have received a copy of the GNU General Public License
16  * along with this program; if not, write to the Free Software
17  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
18  */
19
20 /* how many nesting we support */
21 #define ACPIGEN_LENSTACK_SIZE 10
22
23 /* if you need to change this, change the acpigen_write_f and
24    acpigen_patch_len */
25
26 #define ACPIGEN_MAXLEN 0xfff
27
28 #include <string.h>
29 #include <arch/acpigen.h>
30 #include <console/console.h>
31
32 static char *gencurrent;
33
34 char *len_stack[ACPIGEN_LENSTACK_SIZE];
35 int ltop = 0;
36
37 static int acpigen_write_len_f()
38 {
39         ASSERT(ltop < (ACPIGEN_LENSTACK_SIZE - 1))
40         len_stack[ltop++] = gencurrent;
41         acpigen_emit_byte(0);
42         acpigen_emit_byte(0);
43         return 2;
44 }
45
46 void acpigen_patch_len(int len)
47 {
48         ASSERT(len <= ACPIGEN_MAXLEN)
49         ASSERT(ltop > 0)
50         char *p = len_stack[--ltop];
51         /* generate store length for 0xfff max */
52         p[0] = (0x40 | (len & 0xf));
53         p[1] = (len >> 4 & 0xff);
54
55 }
56
57 void acpigen_set_current(char *curr) {
58     gencurrent = curr;
59 }
60
61 char *acpigen_get_current(void) {
62     return gencurrent;
63 }
64
65 int acpigen_emit_byte(unsigned char b)
66 {
67         (*gencurrent++) = b;
68         return 1;
69 }
70
71 int acpigen_write_package(int nr_el)
72 {
73         int len;
74         /* package op */
75         acpigen_emit_byte(0x12);
76         len = acpigen_write_len_f();
77         acpigen_emit_byte(nr_el);
78         return len + 2;
79 }
80
81 int acpigen_write_byte(unsigned int data)
82 {
83         /* byte op */
84         acpigen_emit_byte(0xa);
85         acpigen_emit_byte(data & 0xff);
86         return 2;
87 }
88
89 int acpigen_write_dword(unsigned int data)
90 {
91         /* dword op */
92         acpigen_emit_byte(0xc);
93         acpigen_emit_byte(data & 0xff);
94         acpigen_emit_byte((data >> 8) & 0xff);
95         acpigen_emit_byte((data >> 16) & 0xff);
96         acpigen_emit_byte((data >> 24) & 0xff);
97         return 5;
98 }
99
100 int acpigen_write_name_byte(char *name, uint8_t val) {
101         int len;
102         len = acpigen_write_name(name);
103         len += acpigen_write_byte(val);
104         return len;
105 }
106
107 int acpigen_write_name_dword(char *name, uint32_t val) {
108         int len;
109         len = acpigen_write_name(name);
110         len += acpigen_write_dword(val);
111         return len;
112 }
113
114 int acpigen_emit_stream(char *data, int size) {
115         int i;
116         for (i = 0; i < size; i++) {
117                 acpigen_emit_byte(data[i]);
118         }
119         return size;
120 }
121
122 int acpigen_write_name(char *name)
123 {
124         int len = strlen(name);
125         /* name op */
126         acpigen_emit_byte(0x8);
127         acpigen_emit_stream(name, len);
128         return len + 1;
129 }
130
131 int acpigen_write_scope(char *name)
132 {
133         int len;
134         /* scope op */
135         acpigen_emit_byte(0x10);
136         len = acpigen_write_len_f();
137         return len + acpigen_emit_stream(name, strlen(name)) + 1;
138 }
139
140 int acpigen_write_processor(u8 cpuindex, u32 pblock_addr, u8 pblock_len)
141 {
142 /*
143         Processor (\_PR.CPUcpuindex, cpuindex, pblock_addr, pblock_len)
144         {
145 */
146         char pscope[16];
147         int  len;
148         /* processor op */
149         acpigen_emit_byte(0x5b);
150         acpigen_emit_byte(0x83);
151         len = acpigen_write_len_f();
152
153         sprintf(pscope, "\\._PR_CPU%x", (unsigned int) cpuindex);
154         len += acpigen_emit_stream(pscope, strlen(pscope));
155         acpigen_emit_byte(cpuindex);
156         acpigen_emit_byte(pblock_addr & 0xff);
157         acpigen_emit_byte((pblock_addr >> 8) & 0xff);
158         acpigen_emit_byte((pblock_addr >> 16) & 0xff);
159         acpigen_emit_byte((pblock_addr >> 24) & 0xff);
160         acpigen_emit_byte(pblock_len);
161         return 6  + 2 + len;
162 }
163
164 int acpigen_write_empty_PCT(void)
165 {
166 /*
167     Name (_PCT, Package (0x02)
168     {
169         ResourceTemplate ()
170         {
171             Register (FFixedHW,
172                 0x00,               // Bit Width
173                 0x00,               // Bit Offset
174                 0x0000000000000000, // Address
175                 ,)
176         },
177
178         ResourceTemplate ()
179         {
180             Register (FFixedHW,
181                 0x00,               // Bit Width
182                 0x00,               // Bit Offset
183                 0x0000000000000000, // Address
184                 ,)
185         }
186     })
187 */
188         static char stream[] = {
189                 0x08, 0x5F, 0x50, 0x43, 0x54, 0x12, 0x2C,       /* 00000030    "0._PCT.," */
190                 0x02, 0x11, 0x14, 0x0A, 0x11, 0x82, 0x0C, 0x00, /* 00000038    "........" */
191                 0x7F, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 00000040    "........" */
192                 0x00, 0x00, 0x00, 0x00, 0x79, 0x00, 0x11, 0x14, /* 00000048    "....y..." */
193                 0x0A, 0x11, 0x82, 0x0C, 0x00, 0x7F, 0x00, 0x00, /* 00000050    "........" */
194                 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 00000058    "........" */
195                 0x00, 0x79, 0x00
196         };
197         return acpigen_emit_stream(stream, ARRAY_SIZE(stream));
198 }
199
200 /* generates a func with max supported P states */
201 int acpigen_write_PPC(u8 nr)
202 {
203 /*
204     Method (_PPC, 0, NotSerialized)
205     {
206         Return (nr)
207     }
208 */
209         int len;
210         /* method op */
211         acpigen_emit_byte(0x14);
212         len = acpigen_write_len_f();
213         len += acpigen_emit_stream("_PPC", 4);
214         /* no fnarg */
215         acpigen_emit_byte(0x00);
216         /* return */
217         acpigen_emit_byte(0xa4);
218         /* arg */
219         len += acpigen_write_byte(nr);
220         acpigen_patch_len(len - 1);
221         return len + 3;
222 }
223
224 int acpigen_write_PSS_package(u32 coreFreq, u32 power, u32 transLat, u32 busmLat,
225                         u32 control, u32 status)
226 {
227         int len;
228         len = acpigen_write_package(6);
229         len += acpigen_write_dword(coreFreq);
230         len += acpigen_write_dword(power);
231         len += acpigen_write_dword(transLat);
232         len += acpigen_write_dword(busmLat);
233         len += acpigen_write_dword(control);
234         len += acpigen_write_dword(status);
235         //pkglen without the len opcode
236         acpigen_patch_len(len - 1);
237         return len;
238 }