58 lines
1.4 KiB
C
58 lines
1.4 KiB
C
#include <u.h>
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#include <libc.h>
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char *datac[] = {0,"#P/iob","#P/iow",0,"#P/iol",0,0,0,"#P/msr"};
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void
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main(int argc, char** argv) {
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int fd, size, op;
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ulong port;
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uvlong data;
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uchar datab[8];
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data = 0;
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size = 1;
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op = -1;
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ARGBEGIN {
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case 'W': size = 2; break;
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case 'L': size = 4; break;
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case 'M': size = 8; break;
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case 'E': datac[1] = datac[2] = datac[4] = datac[8] = "#P/ec"; break;
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case 'r': op = OREAD; break;
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case 'w': op = OWRITE; break;
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default: sysfatal("bad flag %c", ARGC());
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} ARGEND;
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if(op == -1) sysfatal("no operation selected");
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if(argc < 1) sysfatal("no port selected");
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if(op == OWRITE && argc < 2) sysfatal("no data selected");
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port = strtoul(argv[0], 0, 0);
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if(op == OWRITE) data = strtoull(argv[1], 0, 0);
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fd = open(datac[size], op);
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if(fd == -1) sysfatal("open: %r");
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if(op == OWRITE) {
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datab[0] = data;
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datab[1] = data >> 8;
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datab[2] = data >> 16;
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datab[3] = data >> 24;
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datab[4] = data >> 32;
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datab[5] = data >> 40;
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datab[6] = data >> 48;
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datab[7] = data >> 56;
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if(pwrite(fd, datab, size, port) != size)
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sysfatal("pwrite: %r");
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}
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else {
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memset(datab, 0, 8);
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if(pread(fd, datab, size, port) != size)
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sysfatal("pread: %r");
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data = datab[0] | (datab[1] << 8) | (datab[2] << 16) |
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(datab[3] << 24) | ((vlong)datab[4] << 32) |
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((vlong)datab[5] << 40) | ((vlong)datab[6] << 48) |
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((vlong)datab[7] << 56);
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print("0x%ullx\n", data);
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}
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exits(nil);
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}
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