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116 lines
2.8 KiB
116 lines
2.8 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Copyright 2014 Sony Mobile Communications Inc. |
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* |
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* Selftest for runtime system size |
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* |
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* Prints the amount of RAM that the currently running system is using. |
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* |
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* This program tries to be as small as possible itself, to |
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* avoid perturbing the system memory utilization with its |
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* own execution. It also attempts to have as few dependencies |
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* on kernel features as possible. |
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* |
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* It should be statically linked, with startup libs avoided. It uses |
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* no library calls except the syscall() function for the following 3 |
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* syscalls: |
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* sysinfo(), write(), and _exit() |
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* |
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* For output, it avoids printf (which in some C libraries |
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* has large external dependencies) by implementing it's own |
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* number output and print routines, and using __builtin_strlen() |
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* |
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* The test may crash if any of the above syscalls fails because in some |
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* libc implementations (e.g. the GNU C Library) errno is saved in |
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* thread-local storage, which does not get initialized due to avoiding |
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* startup libs. |
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*/ |
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#include <sys/sysinfo.h> |
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#include <unistd.h> |
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#include <sys/syscall.h> |
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#define STDOUT_FILENO 1 |
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static int print(const char *s) |
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{ |
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size_t len = 0; |
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while (s[len] != '\0') |
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len++; |
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return syscall(SYS_write, STDOUT_FILENO, s, len); |
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} |
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static inline char *num_to_str(unsigned long num, char *buf, int len) |
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{ |
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unsigned int digit; |
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/* put digits in buffer from back to front */ |
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buf += len - 1; |
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*buf = 0; |
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do { |
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digit = num % 10; |
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*(--buf) = digit + '0'; |
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num /= 10; |
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} while (num > 0); |
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return buf; |
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} |
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static int print_num(unsigned long num) |
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{ |
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char num_buf[30]; |
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return print(num_to_str(num, num_buf, sizeof(num_buf))); |
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} |
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static int print_k_value(const char *s, unsigned long num, unsigned long units) |
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{ |
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unsigned long long temp; |
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int ccode; |
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print(s); |
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temp = num; |
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temp = (temp * units)/1024; |
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num = temp; |
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ccode = print_num(num); |
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print("\n"); |
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return ccode; |
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} |
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/* this program has no main(), as startup libraries are not used */ |
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void _start(void) |
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{ |
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int ccode; |
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struct sysinfo info; |
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unsigned long used; |
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static const char *test_name = " get runtime memory use\n"; |
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print("TAP version 13\n"); |
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print("# Testing system size.\n"); |
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ccode = syscall(SYS_sysinfo, &info); |
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if (ccode < 0) { |
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print("not ok 1"); |
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print(test_name); |
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print(" ---\n reason: \"could not get sysinfo\"\n ...\n"); |
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syscall(SYS_exit, ccode); |
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} |
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print("ok 1"); |
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print(test_name); |
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/* ignore cache complexities for now */ |
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used = info.totalram - info.freeram - info.bufferram; |
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print("# System runtime memory report (units in Kilobytes):\n"); |
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print(" ---\n"); |
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print_k_value(" Total: ", info.totalram, info.mem_unit); |
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print_k_value(" Free: ", info.freeram, info.mem_unit); |
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print_k_value(" Buffer: ", info.bufferram, info.mem_unit); |
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print_k_value(" In use: ", used, info.mem_unit); |
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print(" ...\n"); |
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print("1..1\n"); |
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syscall(SYS_exit, 0); |
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}
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