156 lines
2.8 KiB
C
156 lines
2.8 KiB
C
/*
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* Copyright (c) 2015, Intel Corporation.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <errno.h>
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#include <stdio.h>
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#include <sys/stat.h>
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#include <linker-defs.h>
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#include <misc/util.h>
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#define USED_RAM_END_ADDR POINTER_TO_UINT(&_end)
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#if defined(CONFIG_ARM)
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#define USED_RAM_SIZE (USED_RAM_END_ADDR - CONFIG_SRAM_BASE_ADDRESS)
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#define MAX_HEAP_SIZE ((KB(CONFIG_SRAM_SIZE)) - USED_RAM_SIZE)
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#elif defined(CONFIG_ARC)
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#define USED_RAM_SIZE (USED_RAM_END_ADDR - CONFIG_RAM_START)
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#define MAX_HEAP_SIZE ((KB(CONFIG_RAM_SIZE)) - USED_RAM_SIZE)
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#else /* X86 */
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#define USED_RAM_SIZE (USED_RAM_END_ADDR - CONFIG_PHYS_RAM_ADDR)
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#define MAX_HEAP_SIZE ((KB(CONFIG_RAM_SIZE)) - USED_RAM_SIZE)
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#endif
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static unsigned char *heap_base = UINT_TO_POINTER(USED_RAM_END_ADDR);
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static unsigned int heap_sz;
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static int _stdout_hook_default(int c)
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{
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(void)(c); /* Prevent warning about unused argument */
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return EOF;
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}
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static int (*_stdout_hook)(int) = _stdout_hook_default;
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void __stdout_hook_install(int (*hook)(int))
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{
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_stdout_hook = hook;
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}
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static unsigned char _stdin_hook_default(void)
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{
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return 0;
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}
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static unsigned char (*_stdin_hook)(void) = _stdin_hook_default;
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void __stdin_hook_install(unsigned char (*hook)(void))
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{
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_stdin_hook = hook;
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}
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int read(int fd, char *buf, int nbytes)
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{
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int i = 0;
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for (i = 0; i < nbytes; i++) {
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*(buf + i) = _stdin_hook();
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if ((*(buf + i) == '\n') || (*(buf + i) == '\r')) {
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i++;
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break;
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}
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}
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return i;
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}
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int write(int fd, char *buf, int nbytes)
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{
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int i;
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for (i = 0; i < nbytes; i++) {
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if (*(buf + i) == '\n') {
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_stdout_hook('\r');
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}
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_stdout_hook(*(buf + i));
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}
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return nbytes;
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}
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int fstat(int fd, struct stat *buf)
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{
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buf->st_mode = S_IFCHR; /* Always pretend to be a tty */
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buf->st_blksize = 0;
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return 0;
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}
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int isatty(int file)
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{
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return 1;
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}
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int kill(int i, int j)
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{
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return 0;
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}
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int getpid(void)
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{
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return 0;
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}
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int _fstat(int file, struct stat *st)
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{
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st->st_mode = S_IFCHR;
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return 0;
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}
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void _exit(int status)
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{
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write(1, "exit", 4);
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while (1) {
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;
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}
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}
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int open(const char *name, int mode)
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{
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return -1;
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}
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int close(int file)
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{
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return -1;
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}
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int lseek(int file, int ptr, int dir)
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{
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return 0;
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}
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void *sbrk(int count)
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{
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void *ptr = heap_base + heap_sz;
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if ((heap_sz + count) < MAX_HEAP_SIZE) {
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heap_sz += count;
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return ptr;
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} else {
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return (void *)-1;
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}
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}
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