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1.1 root 1: /*
2: * Common Option ROM Functions
3: *
4: * This program is free software; you can redistribute it and/or modify
5: * it under the terms of the GNU General Public License as published by
6: * the Free Software Foundation; either version 2 of the License, or
7: * (at your option) any later version.
8: *
9: * This program is distributed in the hope that it will be useful,
10: * but WITHOUT ANY WARRANTY; without even the implied warranty of
11: * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12: * GNU General Public License for more details.
13: *
14: * You should have received a copy of the GNU General Public License
15: * along with this program; if not, see <http://www.gnu.org/licenses/>.
16: *
17: * Copyright Novell Inc, 2009
18: * Authors: Alexander Graf <[email protected]>
19: */
20:
21:
22: #define NO_QEMU_PROTOS
23: #include "../../hw/fw_cfg.h"
24:
25: #define BIOS_CFG_IOPORT_CFG 0x510
26: #define BIOS_CFG_IOPORT_DATA 0x511
27:
28: /* Break the translation block flow so -d cpu shows us values */
29: #define DEBUG_HERE \
30: jmp 1f; \
31: 1:
32:
33: /*
34: * Read a variable from the fw_cfg device.
35: * Clobbers: %edx
36: * Out: %eax
37: */
38: .macro read_fw VAR
39: mov $\VAR, %ax
40: mov $BIOS_CFG_IOPORT_CFG, %dx
41: outw %ax, (%dx)
42: mov $BIOS_CFG_IOPORT_DATA, %dx
43: inb (%dx), %al
44: shl $8, %eax
45: inb (%dx), %al
46: shl $8, %eax
47: inb (%dx), %al
48: shl $8, %eax
49: inb (%dx), %al
50: bswap %eax
51: .endm
52:
1.1.1.2 ! root 53: #define read_fw_blob_pre(var) \
1.1 root 54: read_fw var ## _ADDR; \
55: mov %eax, %edi; \
56: read_fw var ## _SIZE; \
57: mov %eax, %ecx; \
58: mov $var ## _DATA, %ax; \
59: mov $BIOS_CFG_IOPORT_CFG, %edx; \
60: outw %ax, (%dx); \
61: mov $BIOS_CFG_IOPORT_DATA, %dx; \
1.1.1.2 ! root 62: cld
! 63:
! 64: /*
! 65: * Read a blob from the fw_cfg device.
! 66: * Requires _ADDR, _SIZE and _DATA values for the parameter.
! 67: *
! 68: * Clobbers: %eax, %edx, %es, %ecx, %edi
! 69: */
! 70: #define read_fw_blob(var) \
! 71: read_fw_blob_pre(var); \
1.1 root 72: /* old as(1) doesn't like this insn so emit the bytes instead: \
73: rep insb (%dx), %es:(%edi); \
74: */ \
1.1.1.2 ! root 75: .dc.b 0xf3,0x6c
! 76:
! 77: /*
! 78: * Read a blob from the fw_cfg device in forced addr32 mode.
! 79: * Requires _ADDR, _SIZE and _DATA values for the parameter.
! 80: *
! 81: * Clobbers: %eax, %edx, %es, %ecx, %edi
! 82: */
! 83: #define read_fw_blob_addr32(var) \
! 84: read_fw_blob_pre(var); \
! 85: /* old as(1) doesn't like this insn so emit the bytes instead: \
! 86: addr32 rep insb (%dx), %es:(%edi); \
! 87: */ \
1.1 root 88: .dc.b 0x67,0xf3,0x6c
89:
90: #define OPTION_ROM_START \
91: .code16; \
92: .text; \
93: .global _start; \
94: _start:; \
95: .short 0xaa55; \
96: .byte (_end - _start) / 512;
97:
98: #define BOOT_ROM_START \
99: OPTION_ROM_START \
100: push %eax; \
101: push %ds; \
102: \
103: /* setup ds so we can access the IVT */ \
104: xor %ax, %ax; \
105: mov %ax, %ds; \
106: \
107: /* install our int 19 handler */ \
108: movw $int19_handler, (0x19*4); \
109: mov %cs, (0x19*4+2); \
110: \
111: pop %ds; \
112: pop %eax; \
113: lret; \
114: \
115: int19_handler:; \
116: /* DS = CS */ \
117: movw %cs, %ax; \
118: movw %ax, %ds;
119:
120: #define OPTION_ROM_END \
121: .align 512, 0; \
122: _end:
123:
124: #define BOOT_ROM_END \
125: OPTION_ROM_END
126:
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