178 lines
3.3 KiB
C
178 lines
3.3 KiB
C
#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "libsys.h"
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UINT8 g_pattern8[] = {0x01, 0x02, 0x03, 0x4, 0x05, 0x06, 0x07, 0x08};
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UINT16 g_pattern16[sizeof(g_pattern8)/2] = {0};
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UINT32 g_pattern32[sizeof(g_pattern8)/4] = {0};
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UINT8 _g_bytes[4] = {0x12, 0x34, 0x56, 0x78};
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UINT8 _g_bytes2[4] = {0};
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void MakePattern(void)
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{
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int i;
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UINT16 *pPat16 = (UINT16*)g_pattern8;
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UINT32 *pPat32 = (UINT32*)g_pattern8;
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for (i=0; i < sizeof(g_pattern16)/2; i++)
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{
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g_pattern16[i] = pPat16[i];
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}
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for (i=0; i < sizeof(g_pattern32)/4; i++)
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{
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g_pattern32[i] = pPat32[i];
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}
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}
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void PrintPattern(void)
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{
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int i;
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printf("Pattern 8bit:\n");
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for (i=0; i < sizeof(g_pattern8); i++)
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{
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printf("%02X ", g_pattern8[i]);
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}
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printf("\n");
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printf("Pattern 16bit:\n");
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for (i=0; i < sizeof(g_pattern16)/2; i++)
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{
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printf("%04X ", g_pattern16[i]);
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}
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printf("\n");
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printf("Pattern 32bit:\n");
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for (i=0; i < sizeof(g_pattern32)/4; i++)
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{
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printf("%08X ", g_pattern32[i]);
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}
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printf("\n");
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}
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int IsEndianBig(void)
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{
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int i, result;
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UINT8 *pBuf8;
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UINT16 *pBuf16;
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UINT32 *pBuf32;
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UINT16 halve;
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UINT32 word;
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halve = 0x1234;
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word = 0x12345678;
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result = -1;
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for (i=0; i < 4; i++)
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_g_bytes2[i] = _g_bytes[i];
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pBuf8 = (UINT8*)&word;
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if (((*pBuf8+0) == 0x12) && (*(pBuf8+1) == 0x34) && (*(pBuf8+2) == 0x56) && (*(pBuf8+3) == 0x78))
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{
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pBuf8 = (UINT8*)&halve;
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if (((*pBuf8+0) == 0x12) && (*(pBuf8+1) == 0x34))
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{
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result = 1;
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}
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}
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pBuf8 = (UINT8*)&word;
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if (((*pBuf8+0) == 0x78) && (*(pBuf8+1) == 0x56) && (*(pBuf8+2) == 0x34) && (*(pBuf8+3) == 0x12))
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{
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pBuf8 = (UINT8*)&halve;
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if (((*pBuf8+0) == 0x34) && (*(pBuf8+1) == 0x12))
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{
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result = 0;
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}
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}
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return result;
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}
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void PrintCPUinfo(void)
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{
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int result, rev_id;
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int cache_size, cache_line;
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int eb;
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char *cpu_type_str[7] = {"invalid", "R2000", "R3000", "R6000", "R4000", "reserved", "R6000A"};
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// Print Status register
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result = CP0_SR_read();
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printf("--------------------------------------------------\n");
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printf("Status : %8.8X\n", result);
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// Print Revision
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result = CP0_PRID_read();
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rev_id = (result >> 8) & 0xFF;
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printf("CPU type : MIPS ");
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if ((rev_id > 0) && (rev_id < 0x07))
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{
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printf(cpu_type_str[rev_id]);
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printf(" Rev. ");
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rev_id = result & 0xFF;
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printf("%d", rev_id);
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}
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else
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printf("Unknown");
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eb = IsEndianBig();
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if (eb > 0)
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printf(" [Big-endian]\n");
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if (eb == 0)
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printf(" [Little-endian]\n");
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if (eb < 0)
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printf(" [Unknown endian]\n");
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printf("--------------------------------------------------\n");
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}
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int main (void)
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{
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int eb;
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setbuf(stdout, NULL);
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CP0_SR_write(CP0_SR_read() & ~(1 << 25));
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PrintCPUinfo();
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if (IsEndianBig() == 1)
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printf("Endian is big\n");
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if (IsEndianBig() == 0)
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printf("Endian is little\n");
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PrintBuffer8(_g_bytes2, 8, 4);
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MakePattern();
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PrintPattern();
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memset(g_pattern16, 0, sizeof(g_pattern16));
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memset(g_pattern32, 0, sizeof(g_pattern32));
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CP0_SR_write(CP0_SR_read() | (1 << 25));
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eb = IsEndianBig();
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MakePattern();
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CP0_SR_write(CP0_SR_read() & ~(1 << 25));
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if (eb == 1)
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printf("Endian is big\n");
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if (eb == 0)
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printf("Endian is little\n");
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PrintBuffer8(_g_bytes2, 8, 4);
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PrintPattern();
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return 0;
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}
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