103 lines
1.9 KiB
C
103 lines
1.9 KiB
C
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#include "util.h"
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/* Measure the time it takes to access a block with virtual address addr. */
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CYCLES measure_one_block_access_time(ADDR_PTR addr)
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{
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CYCLES cycles;
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asm volatile("mov %1, %%r8\n\t"
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"lfence\n\t"
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"rdtsc\n\t"
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"mov %%eax, %%edi\n\t"
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"mov (%%r8), %%r8\n\t"
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"lfence\n\t"
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"rdtsc\n\t"
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"sub %%edi, %%eax\n\t"
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: "=a"(cycles) /*output*/
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: "r"(addr)
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: "r8", "edi");
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return cycles;
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}
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/*
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* CLFlushes the given address.
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*
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* Note: clflush is provided to help you debug and should not be used in your
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* final submission
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*/
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void clflush(ADDR_PTR addr)
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{
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asm volatile ("clflush (%0)"::"r"(addr));
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}
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/*
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* Converts a string to its binary representation.
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*/
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char *string_to_binary(char *s)
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{
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if (s == NULL)
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return 0; /* no input string */
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size_t len = strlen(s);
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// Each char is one byte (8 bits) and + 1 at the end for null terminator
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char *binary = malloc(len * 8 + 1);
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binary[len] = '\0';
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for (size_t i = 0; i < len; ++i)
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{
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char ch = s[i];
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for (int j = 7; j >= 0; --j)
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{
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if (ch & (1 << j))
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{
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strcat(binary, "1");
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}
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else
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{
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strcat(binary, "0");
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}
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}
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}
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return binary;
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}
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/*
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* Converts a binary string to its ASCII representation.
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*/
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char *binary_to_string(char *data)
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{
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// Each char is 8 bits
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size_t msg_len = strlen(data) / 8;
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// Add one for null terminator at the end
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char *msg = malloc(msg_len + 1);
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msg[msg_len] = '\0';
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for (int i = 0; i < msg_len; i++)
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{
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char tmp[8];
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int k = 0;
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for (int j = i * 8; j < ((i + 1) * 8); j++)
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{
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tmp[k++] = data[j];
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}
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msg[i] = strtol(tmp, 0, 2);
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}
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return msg;
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}
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/*
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* Converts a string to integer
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*/
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int string_to_int(char* s)
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{
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return atoi(s);
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}
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