root / hw / armv7m.c @ 38641a52
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/*
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* ARMV7M System emulation.
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*
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* Copyright (c) 2006-2007 CodeSourcery.
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* Written by Paul Brook
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*
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* This code is licenced under the GPL.
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*/
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#include "vl.h" |
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/* Bitbanded IO. Each word corresponds to a single bit. */
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/* Get the byte address of the real memory for a bitband acess. */
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static inline uint32_t bitband_addr(uint32_t addr) |
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{ |
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uint32_t res; |
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res = addr & 0xe0000000;
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res |= (addr & 0x1ffffff) >> 5; |
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return res;
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} |
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static uint32_t bitband_readb(void *opaque, target_phys_addr_t offset) |
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{ |
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uint8_t v; |
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cpu_physical_memory_read(bitband_addr(offset), &v, 1);
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return (v & (1 << ((offset >> 2) & 7))) != 0; |
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} |
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static void bitband_writeb(void *opaque, target_phys_addr_t offset, |
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uint32_t value) |
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{ |
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uint32_t addr; |
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uint8_t mask; |
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uint8_t v; |
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addr = bitband_addr(offset); |
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mask = (1 << ((offset >> 2) & 7)); |
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cpu_physical_memory_read(addr, &v, 1);
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if (value & 1) |
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v |= mask; |
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else
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v &= ~mask; |
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cpu_physical_memory_write(addr, &v, 1);
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} |
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static uint32_t bitband_readw(void *opaque, target_phys_addr_t offset) |
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{ |
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uint32_t addr; |
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uint16_t mask; |
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uint16_t v; |
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addr = bitband_addr(offset) & ~1;
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mask = (1 << ((offset >> 2) & 15)); |
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mask = tswap16(mask); |
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cpu_physical_memory_read(addr, (uint8_t *)&v, 2);
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return (v & mask) != 0; |
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} |
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static void bitband_writew(void *opaque, target_phys_addr_t offset, |
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uint32_t value) |
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{ |
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uint32_t addr; |
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uint16_t mask; |
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uint16_t v; |
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addr = bitband_addr(offset) & ~1;
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mask = (1 << ((offset >> 2) & 15)); |
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mask = tswap16(mask); |
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cpu_physical_memory_read(addr, (uint8_t *)&v, 2);
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if (value & 1) |
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v |= mask; |
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else
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v &= ~mask; |
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cpu_physical_memory_write(addr, (uint8_t *)&v, 2);
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} |
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static uint32_t bitband_readl(void *opaque, target_phys_addr_t offset) |
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{ |
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uint32_t addr; |
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uint32_t mask; |
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uint32_t v; |
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addr = bitband_addr(offset) & ~3;
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mask = (1 << ((offset >> 2) & 31)); |
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mask = tswap32(mask); |
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cpu_physical_memory_read(addr, (uint8_t *)&v, 4);
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return (v & mask) != 0; |
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} |
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static void bitband_writel(void *opaque, target_phys_addr_t offset, |
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uint32_t value) |
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{ |
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uint32_t addr; |
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uint32_t mask; |
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uint32_t v; |
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addr = bitband_addr(offset) & ~3;
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mask = (1 << ((offset >> 2) & 31)); |
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mask = tswap32(mask); |
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cpu_physical_memory_read(addr, (uint8_t *)&v, 4);
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if (value & 1) |
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v |= mask; |
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else
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v &= ~mask; |
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cpu_physical_memory_write(addr, (uint8_t *)&v, 4);
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} |
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static CPUReadMemoryFunc *bitband_readfn[] = {
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bitband_readb, |
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bitband_readw, |
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bitband_readl |
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}; |
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static CPUWriteMemoryFunc *bitband_writefn[] = {
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bitband_writeb, |
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bitband_writew, |
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bitband_writel |
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}; |
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static void armv7m_bitband_init(void) |
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{ |
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int iomemtype;
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iomemtype = cpu_register_io_memory(0, bitband_readfn, bitband_writefn,
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NULL);
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cpu_register_physical_memory(0x22000000, 0x02000000, iomemtype); |
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cpu_register_physical_memory(0x42000000, 0x02000000, iomemtype); |
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} |
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/* Board init. */
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/* Init CPU and memory for a v7-M based board.
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flash_size and sram_size are in kb.
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Returns the NVIC array. */
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qemu_irq *armv7m_init(int flash_size, int sram_size, |
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const char *kernel_filename, const char *cpu_model) |
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{ |
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CPUState *env; |
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qemu_irq *pic; |
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uint32_t pc; |
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int image_size;
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uint64_t entry; |
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uint64_t lowaddr; |
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flash_size *= 1024;
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sram_size *= 1024;
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if (!cpu_model)
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cpu_model = "cortex-m3";
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env = cpu_init(cpu_model); |
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if (!env) {
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fprintf(stderr, "Unable to find CPU definition\n");
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exit(1);
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} |
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#if 0
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/* > 32Mb SRAM gets complicated because it overlaps the bitband area.
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We don't have proper commandline options, so allocate half of memory
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as SRAM, up to a maximum of 32Mb, and the rest as code. */
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if (ram_size > (512 + 32) * 1024 * 1024)
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ram_size = (512 + 32) * 1024 * 1024;
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sram_size = (ram_size / 2) & TARGET_PAGE_MASK;
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if (sram_size > 32 * 1024 * 1024)
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sram_size = 32 * 1024 * 1024;
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code_size = ram_size - sram_size;
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#endif
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/* Flash programming is done via the SCU, so pretend it is ROM. */
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cpu_register_physical_memory(0, flash_size, IO_MEM_ROM);
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cpu_register_physical_memory(0x20000000, sram_size,
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flash_size + IO_MEM_RAM); |
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armv7m_bitband_init(); |
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pic = armv7m_nvic_init(env); |
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image_size = load_elf(kernel_filename, 0, &entry, &lowaddr, NULL); |
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if (image_size < 0) { |
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image_size = load_image(kernel_filename, phys_ram_base); |
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lowaddr = 0;
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} |
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if (image_size < 0) { |
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fprintf(stderr, "qemu: could not load kernel '%s'\n",
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kernel_filename); |
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exit(1);
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} |
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/* If the image was loaded at address zero then assume it is a
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regular ROM image and perform the normal CPU reset sequence.
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Otherwise jump directly to the entry point. */
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if (lowaddr == 0) { |
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env->regs[13] = tswap32(*(uint32_t *)phys_ram_base);
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pc = tswap32(*(uint32_t *)(phys_ram_base + 4));
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} else {
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pc = entry; |
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} |
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env->thumb = pc & 1;
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env->regs[15] = pc & ~1; |
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/* Hack to map an additional page of ram at the top of the address
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space. This stops qemu complaining about executing code outside RAM
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when returning from an exception. */
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cpu_register_physical_memory(0xfffff000, 0x1000, IO_MEM_RAM + ram_size); |
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return pic;
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} |
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