keep static code gen buffer for user mode - mark user mode reserved pages after all big allocations
git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@4611 c046a42c-6fe2-441c-8c8c-71466251a162
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parent
fbb4a2e371
commit
4369415f1e
34
exec.c
34
exec.c
@ -187,14 +187,15 @@ static void map_exec(void *addr, long size)
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#else
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static void map_exec(void *addr, long size)
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{
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unsigned long start, end;
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unsigned long start, end, page_size;
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page_size = getpagesize();
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start = (unsigned long)addr;
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start &= ~(qemu_real_host_page_size - 1);
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start &= ~(page_size - 1);
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end = (unsigned long)addr + size;
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end += qemu_real_host_page_size - 1;
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end &= ~(qemu_real_host_page_size - 1);
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end += page_size - 1;
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end &= ~(page_size - 1);
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mprotect((void *)start, end - start,
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PROT_READ | PROT_WRITE | PROT_EXEC);
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@ -326,12 +327,34 @@ static void tlb_unprotect_code_phys(CPUState *env, ram_addr_t ram_addr,
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target_ulong vaddr);
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#endif
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#define DEFAULT_CODE_GEN_BUFFER_SIZE (32 * 1024 * 1024)
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#if defined(CONFIG_USER_ONLY)
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/* Currently it is not recommanded to allocate big chunks of data in
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user mode. It will change when a dedicated libc will be used */
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#define USE_STATIC_CODE_GEN_BUFFER
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#endif
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#ifdef USE_STATIC_CODE_GEN_BUFFER
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static uint8_t static_code_gen_buffer[DEFAULT_CODE_GEN_BUFFER_SIZE];
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#endif
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void code_gen_alloc(unsigned long tb_size)
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{
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#ifdef USE_STATIC_CODE_GEN_BUFFER
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code_gen_buffer = static_code_gen_buffer;
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code_gen_buffer_size = DEFAULT_CODE_GEN_BUFFER_SIZE;
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map_exec(code_gen_buffer, code_gen_buffer_size);
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#else
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code_gen_buffer_size = tb_size;
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if (code_gen_buffer_size == 0) {
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#if defined(CONFIG_USER_ONLY)
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/* in user mode, phys_ram_size is not meaningful */
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code_gen_buffer_size = DEFAULT_CODE_GEN_BUFFER_SIZE;
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#else
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/* XXX: needs ajustments */
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code_gen_buffer_size = (int)(phys_ram_size / 4);
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#endif
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}
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if (code_gen_buffer_size < MIN_CODE_GEN_BUFFER_SIZE)
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code_gen_buffer_size = MIN_CODE_GEN_BUFFER_SIZE;
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@ -363,6 +386,7 @@ void code_gen_alloc(unsigned long tb_size)
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}
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map_exec(code_gen_buffer, code_gen_buffer_size);
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#endif
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#endif /* !USE_STATIC_CODE_GEN_BUFFER */
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map_exec(code_gen_prologue, sizeof(code_gen_prologue));
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code_gen_buffer_max_size = code_gen_buffer_size -
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code_gen_max_block_size();
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@ -375,10 +399,10 @@ void code_gen_alloc(unsigned long tb_size)
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size. */
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void cpu_exec_init_all(unsigned long tb_size)
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{
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page_init();
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cpu_gen_init();
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code_gen_alloc(tb_size);
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code_gen_ptr = code_gen_buffer;
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page_init();
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io_mem_init();
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}
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