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
33 #if defined(__i386__) && !defined(CONFIG_SOFTMMU) && !defined(CONFIG_USER_ONLY)
38 /* When not using soft mmu, libc independant functions are needed for
39 the CPU core because it needs to use alternates stacks and
40 libc/thread incompatibles settings */
42 #include <linux/unistd.h>
44 #define QEMU_SYSCALL0(name) \
47 __asm__ volatile ("int $0x80" \
49 : "0" (__NR_##name)); \
53 #define QEMU_SYSCALL1(name,arg1) \
56 __asm__ volatile ("int $0x80" \
58 : "0" (__NR_##name),"b" ((long)(arg1))); \
62 #define QEMU_SYSCALL2(name,arg1,arg2) \
65 __asm__ volatile ("int $0x80" \
67 : "0" (__NR_##name),"b" ((long)(arg1)),"c" ((long)(arg2))); \
71 #define QEMU_SYSCALL3(name,arg1,arg2,arg3) \
74 __asm__ volatile ("int $0x80" \
76 : "0" (__NR_##name),"b" ((long)(arg1)),"c" ((long)(arg2)), \
77 "d" ((long)(arg3))); \
81 #define QEMU_SYSCALL4(name,arg1,arg2,arg3,arg4) \
84 __asm__ volatile ("int $0x80" \
86 : "0" (__NR_##name),"b" ((long)(arg1)),"c" ((long)(arg2)), \
87 "d" ((long)(arg3)),"S" ((long)(arg4))); \
91 #define QEMU_SYSCALL5(name,arg1,arg2,arg3,arg4,arg5) \
94 __asm__ volatile ("int $0x80" \
96 : "0" (__NR_##name),"b" ((long)(arg1)),"c" ((long)(arg2)), \
97 "d" ((long)(arg3)),"S" ((long)(arg4)),"D" ((long)(arg5))); \
101 #define QEMU_SYSCALL6(name,arg1,arg2,arg3,arg4,arg5,arg6) \
104 __asm__ volatile ("push %%ebp ; movl %%eax,%%ebp ; movl %1,%%eax ; int $0x80 ; pop %%ebp" \
106 : "i" (__NR_##name),"b" ((long)(arg1)),"c" ((long)(arg2)), \
107 "d" ((long)(arg3)),"S" ((long)(arg4)),"D" ((long)(arg5)), \
108 "0" ((long)(arg6))); \
112 int qemu_write(int fd, const void *buf, size_t n)
114 QEMU_SYSCALL3(write, fd, buf, n);
119 /****************************************************************/
120 /* shmat replacement */
122 int qemu_ipc(int call, unsigned long first,
123 unsigned long second, unsigned long third,
124 void *ptr, unsigned long fifth)
126 QEMU_SYSCALL6(ipc, call, first, second, third, ptr, fifth);
131 /* we must define shmat so that a specific address will be used when
132 mapping the X11 ximage */
133 void *shmat(int shmid, const void *shmaddr, int shmflg)
137 /* we give an address in the right memory area */
139 shmaddr = get_mmap_addr(8192 * 1024);
140 ret = qemu_ipc(SHMAT, shmid, shmflg, (unsigned long)&ptr, (void *)shmaddr, 0);
146 /****************************************************************/
147 /* memory allocation */
149 //#define DEBUG_MALLOC
151 #define MALLOC_BASE 0xab000000
152 #define PHYS_RAM_BASE 0xac000000
154 #define MALLOC_ALIGN 16
155 #define BLOCK_HEADER_SIZE 16
157 typedef struct MemoryBlock {
158 struct MemoryBlock *next;
159 unsigned long size; /* size of block, including header */
162 static MemoryBlock *first_free_block;
163 static unsigned long malloc_addr = MALLOC_BASE;
165 static void *malloc_get_space(size_t size)
168 size = TARGET_PAGE_ALIGN(size);
169 ptr = mmap((void *)malloc_addr, size,
170 PROT_WRITE | PROT_READ,
171 MAP_PRIVATE | MAP_FIXED | MAP_ANON, -1, 0);
172 if (ptr == MAP_FAILED)
178 void *qemu_malloc(size_t size)
180 MemoryBlock *mb, *mb1, **pmb;
182 size_t size1, area_size;
187 size = (size + BLOCK_HEADER_SIZE + MALLOC_ALIGN - 1) & ~(MALLOC_ALIGN - 1);
188 pmb = &first_free_block;
193 if (size <= mb->size)
197 /* no big enough blocks found: get new space */
198 area_size = TARGET_PAGE_ALIGN(size);
199 mb = malloc_get_space(area_size);
202 size1 = area_size - size;
204 /* create a new free block */
205 mb1 = (MemoryBlock *)((uint8_t *)mb + size);
212 /* a free block was found: use it */
213 size1 = mb->size - size;
215 /* create a new free block */
216 mb1 = (MemoryBlock *)((uint8_t *)mb + size);
217 mb1->next = mb->next;
221 /* suppress the first block */
227 ptr = ((uint8_t *)mb + BLOCK_HEADER_SIZE);
229 qemu_printf("malloc: size=0x%x ptr=0x%lx\n", size, (unsigned long)ptr);
234 void qemu_free(void *ptr)
240 mb = (MemoryBlock *)((uint8_t *)ptr - BLOCK_HEADER_SIZE);
241 mb->next = first_free_block;
242 first_free_block = mb;
245 /****************************************************************/
246 /* virtual memory allocation */
248 unsigned long mmap_addr = PHYS_RAM_BASE;
250 void *get_mmap_addr(unsigned long size)
254 mmap_addr += ((size + 4095) & ~4095) + 4096;
260 int qemu_write(int fd, const void *buf, size_t n)
263 ret = write(fd, buf, n);
270 void *get_mmap_addr(unsigned long size)
275 void qemu_free(void *ptr)
280 void *qemu_malloc(size_t size)
287 void *qemu_mallocz(size_t size)
290 ptr = qemu_malloc(size);
293 memset(ptr, 0, size);
297 /****************************************************************/
300 static inline int qemu_isdigit(int c)
302 return c >= '0' && c <= '9';
305 #define OUTCHAR(c) (buflen > 0? (--buflen, *buf++ = (c)): 0)
307 /* from BSD ppp sources */
308 int qemu_vsnprintf(char *buf, int buflen, const char *fmt, va_list args)
311 int width, prec, fillch;
313 unsigned long val = 0;
317 static const char hexchars[] = "0123456789abcdef";
322 for (f = fmt; *f != '%' && *f != 0; ++f)
328 memcpy(buf, fmt, len);
343 width = va_arg(args, int);
346 while (qemu_isdigit(c)) {
347 width = width * 10 + c - '0';
354 prec = va_arg(args, int);
357 while (qemu_isdigit(c)) {
358 prec = prec * 10 + c - '0';
377 i = va_arg(args, int);
386 val = va_arg(args, unsigned int);
391 val = va_arg(args, unsigned int);
395 val = (unsigned long) va_arg(args, void *);
400 str = va_arg(args, char *);
403 num[0] = va_arg(args, int);
410 --fmt; /* so %z outputs %z etc. */
415 str = num + sizeof(num);
417 while (str > num + neg) {
418 *--str = hexchars[val % base];
420 if (--prec <= 0 && val == 0)
432 len = num + sizeof(num) - 1 - str;
435 if (prec > 0 && len > prec)
441 if ((n = width - len) > 0) {
449 memcpy(buf, str, len);
457 void qemu_vprintf(const char *fmt, va_list ap)
462 len = qemu_vsnprintf(buf, sizeof(buf), fmt, ap);
463 qemu_write(1, buf, len);
466 void qemu_printf(const char *fmt, ...)
470 qemu_vprintf(fmt, ap);