2 * QEMU low level functions
4 * Copyright (c) 2003 Fabrice Bellard
6 * Permission is hereby granted, free of charge, to any person obtaining a copy
7 * of this software and associated documentation files (the "Software"), to deal
8 * in the Software without restriction, including without limitation the rights
9 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
10 * copies of the Software, and to permit persons to whom the Software is
11 * furnished to do so, subject to the following conditions:
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
35 #if defined(__i386__) && !defined(CONFIG_SOFTMMU) && !defined(CONFIG_USER_ONLY)
37 /* When not using soft mmu, libc independant functions are needed for
38 the CPU core because it needs to use alternates stacks and
39 libc/thread incompatibles settings */
41 #include <linux/unistd.h>
43 #define QEMU_SYSCALL0(name) \
46 __asm__ volatile ("int $0x80" \
48 : "0" (__NR_##name)); \
52 #define QEMU_SYSCALL1(name,arg1) \
55 __asm__ volatile ("int $0x80" \
57 : "0" (__NR_##name),"b" ((long)(arg1))); \
61 #define QEMU_SYSCALL2(name,arg1,arg2) \
64 __asm__ volatile ("int $0x80" \
66 : "0" (__NR_##name),"b" ((long)(arg1)),"c" ((long)(arg2))); \
70 #define QEMU_SYSCALL3(name,arg1,arg2,arg3) \
73 __asm__ volatile ("int $0x80" \
75 : "0" (__NR_##name),"b" ((long)(arg1)),"c" ((long)(arg2)), \
76 "d" ((long)(arg3))); \
80 #define QEMU_SYSCALL4(name,arg1,arg2,arg3,arg4) \
83 __asm__ volatile ("int $0x80" \
85 : "0" (__NR_##name),"b" ((long)(arg1)),"c" ((long)(arg2)), \
86 "d" ((long)(arg3)),"S" ((long)(arg4))); \
90 #define QEMU_SYSCALL5(name,arg1,arg2,arg3,arg4,arg5) \
93 __asm__ volatile ("int $0x80" \
95 : "0" (__NR_##name),"b" ((long)(arg1)),"c" ((long)(arg2)), \
96 "d" ((long)(arg3)),"S" ((long)(arg4)),"D" ((long)(arg5))); \
100 #define QEMU_SYSCALL6(name,arg1,arg2,arg3,arg4,arg5,arg6) \
103 __asm__ volatile ("push %%ebp ; movl %%eax,%%ebp ; movl %1,%%eax ; int $0x80 ; pop %%ebp" \
105 : "i" (__NR_##name),"b" ((long)(arg1)),"c" ((long)(arg2)), \
106 "d" ((long)(arg3)),"S" ((long)(arg4)),"D" ((long)(arg5)), \
107 "0" ((long)(arg6))); \
111 int qemu_write(int fd, const void *buf, size_t n)
113 QEMU_SYSCALL3(write, fd, buf, n);
118 /****************************************************************/
119 /* shmat replacement */
121 int qemu_ipc(int call, unsigned long first,
122 unsigned long second, unsigned long third,
123 void *ptr, unsigned long fifth)
125 QEMU_SYSCALL6(ipc, call, first, second, third, ptr, fifth);
130 /* we must define shmat so that a specific address will be used when
131 mapping the X11 ximage */
132 void *shmat(int shmid, const void *shmaddr, int shmflg)
136 /* we give an address in the right memory area */
138 shmaddr = get_mmap_addr(8192 * 1024);
139 ret = qemu_ipc(SHMAT, shmid, shmflg, (unsigned long)&ptr, (void *)shmaddr, 0);
145 /****************************************************************/
146 /* memory allocation */
148 //#define DEBUG_MALLOC
150 #define MALLOC_BASE 0xab000000
151 #define PHYS_RAM_BASE 0xac000000
153 #define MALLOC_ALIGN 16
154 #define BLOCK_HEADER_SIZE 16
156 typedef struct MemoryBlock {
157 struct MemoryBlock *next;
158 unsigned long size; /* size of block, including header */
161 static MemoryBlock *first_free_block;
162 static unsigned long malloc_addr = MALLOC_BASE;
164 static void *malloc_get_space(size_t size)
167 size = TARGET_PAGE_ALIGN(size);
168 ptr = mmap((void *)malloc_addr, size,
169 PROT_WRITE | PROT_READ,
170 MAP_PRIVATE | MAP_FIXED | MAP_ANON, -1, 0);
171 if (ptr == MAP_FAILED)
177 void *qemu_malloc(size_t size)
179 MemoryBlock *mb, *mb1, **pmb;
181 size_t size1, area_size;
186 size = (size + BLOCK_HEADER_SIZE + MALLOC_ALIGN - 1) & ~(MALLOC_ALIGN - 1);
187 pmb = &first_free_block;
192 if (size <= mb->size)
196 /* no big enough blocks found: get new space */
197 area_size = TARGET_PAGE_ALIGN(size);
198 mb = malloc_get_space(area_size);
201 size1 = area_size - size;
203 /* create a new free block */
204 mb1 = (MemoryBlock *)((uint8_t *)mb + size);
211 /* a free block was found: use it */
212 size1 = mb->size - size;
214 /* create a new free block */
215 mb1 = (MemoryBlock *)((uint8_t *)mb + size);
216 mb1->next = mb->next;
220 /* suppress the first block */
226 ptr = ((uint8_t *)mb + BLOCK_HEADER_SIZE);
228 qemu_printf("malloc: size=0x%x ptr=0x%lx\n", size, (unsigned long)ptr);
233 void qemu_free(void *ptr)
237 mb = (MemoryBlock *)((uint8_t *)ptr - BLOCK_HEADER_SIZE);
238 mb->next = first_free_block;
239 first_free_block = mb;
242 /****************************************************************/
243 /* virtual memory allocation */
245 unsigned long mmap_addr = PHYS_RAM_BASE;
247 void *get_mmap_addr(unsigned long size)
251 mmap_addr += ((size + 4095) & ~4095) + 4096;
257 int qemu_write(int fd, const void *buf, size_t n)
260 ret = write(fd, buf, n);
267 void *get_mmap_addr(unsigned long size)
272 void qemu_free(void *ptr)
277 void *qemu_malloc(size_t size)
284 void *qemu_mallocz(size_t size)
287 ptr = qemu_malloc(size);
290 memset(ptr, 0, size);
294 /****************************************************************/
297 static inline int qemu_isdigit(int c)
299 return c >= '0' && c <= '9';
302 #define OUTCHAR(c) (buflen > 0? (--buflen, *buf++ = (c)): 0)
304 /* from BSD ppp sources */
305 int qemu_vsnprintf(char *buf, int buflen, const char *fmt, va_list args)
308 int width, prec, fillch;
310 unsigned long val = 0;
314 static const char hexchars[] = "0123456789abcdef";
319 for (f = fmt; *f != '%' && *f != 0; ++f)
325 memcpy(buf, fmt, len);
340 width = va_arg(args, int);
343 while (qemu_isdigit(c)) {
344 width = width * 10 + c - '0';
351 prec = va_arg(args, int);
354 while (qemu_isdigit(c)) {
355 prec = prec * 10 + c - '0';
374 i = va_arg(args, int);
383 val = va_arg(args, unsigned int);
388 val = va_arg(args, unsigned int);
392 val = (unsigned long) va_arg(args, void *);
397 str = va_arg(args, char *);
400 num[0] = va_arg(args, int);
407 --fmt; /* so %z outputs %z etc. */
412 str = num + sizeof(num);
414 while (str > num + neg) {
415 *--str = hexchars[val % base];
417 if (--prec <= 0 && val == 0)
429 len = num + sizeof(num) - 1 - str;
432 if (prec > 0 && len > prec)
438 if ((n = width - len) > 0) {
446 memcpy(buf, str, len);
454 void qemu_vprintf(const char *fmt, va_list ap)
459 len = qemu_vsnprintf(buf, sizeof(buf), fmt, ap);
460 qemu_write(1, buf, len);
463 void qemu_printf(const char *fmt, ...)
467 qemu_vprintf(fmt, ap);