49 lines
1.2 KiB
C
49 lines
1.2 KiB
C
#include <u.h>
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#include <libc.h>
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const char datac[] = {0,'b','w',0,'l'};
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void
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main(int argc, char** argv) {
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ulong size, segsize, op, port;
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char* segment;
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ulong data;
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uchar *seg;
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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 '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 < 3) sysfatal("no address, no segsize or no segment selected");
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if(op == OWRITE && argc < 4) sysfatal("no data selected");
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segment = argv[0];
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segsize = strtoul(argv[1], 0, 0);
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port = strtoul(argv[2], 0, 0);
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if(op == OWRITE) data = strtoul(argv[3], 0, 0);
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seg = segattach(0, segment, 0, segsize);
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if(seg == (uchar*)-1) sysfatal("segattach: %r");
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if(op == OWRITE) {
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switch(size) {
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case 1: *(uchar*)(seg+port) = data; break;
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case 2: *(ushort*)(seg+port) = data; break;
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case 4: *(ulong*)(seg+port) = data; break;
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}
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}
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else {
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data = seg[port];
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if(size >= 2) data |= seg[port+1] << 8;
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if(size >= 4) data |= (seg[port+2] << 16) | (seg[port+3] << 24);
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print("0x%ulx\n", data);
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}
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exits(nil);
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}
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