Patrick Georgi | 1e916e0 | 2011-01-28 07:54:11 +0000 | [diff] [blame] | 1 | #include <assert.h> |
| 2 | #include "cmos_lowlevel.h" |
| 3 | |
| 4 | #if defined(__FreeBSD__) |
| 5 | #include <sys/types.h> |
| 6 | #include <machine/cpufunc.h> |
| 7 | #define OUTB(x, y) do { u_int tmp = (y); outb(tmp, (x)); } while (0) |
| 8 | #define OUTW(x, y) do { u_int tmp = (y); outw(tmp, (x)); } while (0) |
| 9 | #define OUTL(x, y) do { u_int tmp = (y); outl(tmp, (x)); } while (0) |
| 10 | #define INB(x) __extension__ ({ u_int tmp = (x); inb(tmp); }) |
| 11 | #define INW(x) __extension__ ({ u_int tmp = (x); inw(tmp); }) |
| 12 | #define INL(x) __extension__ ({ u_int tmp = (x); inl(tmp); }) |
| 13 | #else |
| 14 | #if defined(__GLIBC__) |
| 15 | #include <sys/io.h> |
| 16 | #endif |
| 17 | #if (defined(__MACH__) && defined(__APPLE__)) |
| 18 | #include <DirectIO/darwinio.h> |
| 19 | #endif |
jakllsch | b0c94a1 | 2011-02-08 16:07:49 +0000 | [diff] [blame^] | 20 | #if defined(__NetBSD__) |
| 21 | #if defined(__i386__) || defined(__x86_64__) |
| 22 | #include <machine/sysarch.h> |
| 23 | |
| 24 | static inline void outb(uint8_t value, uint16_t port) |
| 25 | { |
| 26 | asm volatile ("outb %b0,%w1": :"a" (value), "Nd" (port)); |
| 27 | } |
| 28 | |
| 29 | static inline uint8_t inb(uint16_t port) |
| 30 | { |
| 31 | uint8_t value; |
| 32 | asm volatile ("inb %w1,%0":"=a" (value):"Nd" (port)); |
| 33 | return value; |
| 34 | } |
| 35 | |
| 36 | static inline void outw(uint16_t value, uint16_t port) |
| 37 | { |
| 38 | asm volatile ("outw %w0,%w1": :"a" (value), "Nd" (port)); |
| 39 | } |
| 40 | |
| 41 | static inline uint16_t inw(uint16_t port) |
| 42 | { |
| 43 | uint16_t value; |
| 44 | asm volatile ("inw %w1,%0":"=a" (value):"Nd" (port)); |
| 45 | return value; |
| 46 | } |
| 47 | |
| 48 | static inline void outl(uint32_t value, uint16_t port) |
| 49 | { |
| 50 | asm volatile ("outl %0,%w1": :"a" (value), "Nd" (port)); |
| 51 | } |
| 52 | |
| 53 | static inline uint32_t inl(uint16_t port) |
| 54 | { |
| 55 | uint32_t value; |
| 56 | asm volatile ("inl %1,%0":"=a" (value):"Nd" (port)); |
| 57 | return value; |
| 58 | } |
| 59 | #endif |
| 60 | #ifdef __x86_64__ |
| 61 | #define iopl x86_64_iopl |
| 62 | #endif |
| 63 | #ifdef __i386__ |
| 64 | #define iopl i386_iopl |
| 65 | #endif |
| 66 | #endif |
Patrick Georgi | 1e916e0 | 2011-01-28 07:54:11 +0000 | [diff] [blame] | 67 | #define OUTB outb |
| 68 | #define OUTW outw |
| 69 | #define OUTL outl |
| 70 | #define INB inb |
| 71 | #define INW inw |
| 72 | #define INL inl |
| 73 | #endif |
| 74 | |
| 75 | static void cmos_hal_init(void* data); |
| 76 | static unsigned char cmos_hal_read(unsigned addr); |
| 77 | static void cmos_hal_write(unsigned addr, unsigned char value); |
| 78 | static void cmos_set_iopl(int level); |
| 79 | |
| 80 | /* no need to initialize anything */ |
| 81 | static void cmos_hal_init(__attribute__((unused)) void *data) |
| 82 | { |
| 83 | } |
| 84 | |
| 85 | static unsigned char cmos_hal_read(unsigned index) |
| 86 | { |
| 87 | unsigned short port_0, port_1; |
| 88 | |
| 89 | assert(!verify_cmos_byte_index(index)); |
| 90 | |
| 91 | if (index < 128) { |
| 92 | port_0 = 0x70; |
| 93 | port_1 = 0x71; |
| 94 | } else { |
| 95 | port_0 = 0x72; |
| 96 | port_1 = 0x73; |
| 97 | } |
| 98 | |
| 99 | OUTB(index, port_0); |
| 100 | return INB(port_1); |
| 101 | } |
| 102 | |
| 103 | static void cmos_hal_write(unsigned index, unsigned char value) |
| 104 | { |
| 105 | unsigned short port_0, port_1; |
| 106 | |
| 107 | assert(!verify_cmos_byte_index(index)); |
| 108 | |
| 109 | if (index < 128) { |
| 110 | port_0 = 0x70; |
| 111 | port_1 = 0x71; |
| 112 | } else { |
| 113 | port_0 = 0x72; |
| 114 | port_1 = 0x73; |
| 115 | } |
| 116 | |
| 117 | OUTB(index, port_0); |
| 118 | OUTB(value, port_1); |
| 119 | } |
| 120 | |
| 121 | |
| 122 | /**************************************************************************** |
| 123 | * cmos_set_iopl |
| 124 | * |
| 125 | * Set the I/O privilege level of the executing process. Root privileges are |
| 126 | * required for performing this action. A sufficient I/O privilege level |
| 127 | * allows the process to access x86 I/O address space and to disable/reenable |
| 128 | * interrupts while executing in user space. Messing with the I/O privilege |
| 129 | * level is therefore somewhat dangerous. |
| 130 | ****************************************************************************/ |
| 131 | static void cmos_set_iopl(int level) |
| 132 | { |
| 133 | #if defined(__FreeBSD__) |
| 134 | static int io_fd = -1; |
| 135 | #endif |
| 136 | |
| 137 | assert((level >= 0) && (level <= 3)); |
| 138 | |
| 139 | #if defined(__FreeBSD__) |
| 140 | if (level == 0) { |
| 141 | if (io_fd != -1) { |
| 142 | close(io_fd); |
| 143 | io_fd = -1; |
| 144 | } |
| 145 | } else { |
| 146 | if (io_fd == -1) { |
| 147 | io_fd = open("/dev/io", O_RDWR); |
| 148 | if (io_fd < 0) { |
| 149 | perror("/dev/io"); |
| 150 | exit(1); |
| 151 | } |
| 152 | } |
| 153 | } |
| 154 | #else |
| 155 | if (iopl(level)) { |
| 156 | fprintf(stderr, "%s: iopl() system call failed. " |
| 157 | "You must be root to do this.\n", prog_name); |
| 158 | exit(1); |
| 159 | } |
| 160 | #endif |
| 161 | } |
| 162 | |
| 163 | cmos_access_t cmos_hal = { |
| 164 | .init = cmos_hal_init, |
| 165 | .read = cmos_hal_read, |
| 166 | .write = cmos_hal_write, |
| 167 | .set_iopl = cmos_set_iopl, |
| 168 | }; |
| 169 | |