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https://github.com/cirosantilli/linux-kernel-module-cheat.git
synced 2026-01-23 02:05:57 +01:00
dae60aa248
Then inside, split packages/lkmc into kernel_modules and userland, to keep userland out of the kernel_modules parent path, which makes no sense. Copy built modules and userland to the output rootfs overlay. Document Linux distro tradeoffs.
22 lines
457 B
C
22 lines
457 B
C
/* https://github.com/cirosantilli/linux-kernel-module-cheat#userland-physical-address-experiments */
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#define _XOPEN_SOURCE 700
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#include <stdint.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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enum { I0 = 0x12345678 };
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static volatile uint32_t i = I0;
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int main(void) {
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printf("vaddr %p\n", (void *)&i);
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printf("pid %ju\n", (uintmax_t)getpid());
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while (i == I0) {
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sleep(1);
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}
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printf("i %jx\n", (uintmax_t)i);
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return EXIT_SUCCESS;
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}
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