285 lines
7.6 KiB
C
285 lines
7.6 KiB
C
/*
|
|
* ARMV7M System emulation.
|
|
*
|
|
* Copyright (c) 2006-2007 CodeSourcery.
|
|
* Written by Paul Brook
|
|
*
|
|
* This code is licensed under the GPL.
|
|
*/
|
|
|
|
#include "sysbus.h"
|
|
#include "arm-misc.h"
|
|
#include "loader.h"
|
|
#include "elf.h"
|
|
|
|
/* Bitbanded IO. Each word corresponds to a single bit. */
|
|
|
|
/* Get the byte address of the real memory for a bitband access. */
|
|
static inline uint32_t bitband_addr(void * opaque, uint32_t addr)
|
|
{
|
|
uint32_t res;
|
|
|
|
res = *(uint32_t *)opaque;
|
|
res |= (addr & 0x1ffffff) >> 5;
|
|
return res;
|
|
|
|
}
|
|
|
|
static uint32_t bitband_readb(void *opaque, target_phys_addr_t offset)
|
|
{
|
|
uint8_t v;
|
|
cpu_physical_memory_read(bitband_addr(opaque, offset), &v, 1);
|
|
return (v & (1 << ((offset >> 2) & 7))) != 0;
|
|
}
|
|
|
|
static void bitband_writeb(void *opaque, target_phys_addr_t offset,
|
|
uint32_t value)
|
|
{
|
|
uint32_t addr;
|
|
uint8_t mask;
|
|
uint8_t v;
|
|
addr = bitband_addr(opaque, offset);
|
|
mask = (1 << ((offset >> 2) & 7));
|
|
cpu_physical_memory_read(addr, &v, 1);
|
|
if (value & 1)
|
|
v |= mask;
|
|
else
|
|
v &= ~mask;
|
|
cpu_physical_memory_write(addr, &v, 1);
|
|
}
|
|
|
|
static uint32_t bitband_readw(void *opaque, target_phys_addr_t offset)
|
|
{
|
|
uint32_t addr;
|
|
uint16_t mask;
|
|
uint16_t v;
|
|
addr = bitband_addr(opaque, offset) & ~1;
|
|
mask = (1 << ((offset >> 2) & 15));
|
|
mask = tswap16(mask);
|
|
cpu_physical_memory_read(addr, (uint8_t *)&v, 2);
|
|
return (v & mask) != 0;
|
|
}
|
|
|
|
static void bitband_writew(void *opaque, target_phys_addr_t offset,
|
|
uint32_t value)
|
|
{
|
|
uint32_t addr;
|
|
uint16_t mask;
|
|
uint16_t v;
|
|
addr = bitband_addr(opaque, offset) & ~1;
|
|
mask = (1 << ((offset >> 2) & 15));
|
|
mask = tswap16(mask);
|
|
cpu_physical_memory_read(addr, (uint8_t *)&v, 2);
|
|
if (value & 1)
|
|
v |= mask;
|
|
else
|
|
v &= ~mask;
|
|
cpu_physical_memory_write(addr, (uint8_t *)&v, 2);
|
|
}
|
|
|
|
static uint32_t bitband_readl(void *opaque, target_phys_addr_t offset)
|
|
{
|
|
uint32_t addr;
|
|
uint32_t mask;
|
|
uint32_t v;
|
|
addr = bitband_addr(opaque, offset) & ~3;
|
|
mask = (1 << ((offset >> 2) & 31));
|
|
mask = tswap32(mask);
|
|
cpu_physical_memory_read(addr, (uint8_t *)&v, 4);
|
|
return (v & mask) != 0;
|
|
}
|
|
|
|
static void bitband_writel(void *opaque, target_phys_addr_t offset,
|
|
uint32_t value)
|
|
{
|
|
uint32_t addr;
|
|
uint32_t mask;
|
|
uint32_t v;
|
|
addr = bitband_addr(opaque, offset) & ~3;
|
|
mask = (1 << ((offset >> 2) & 31));
|
|
mask = tswap32(mask);
|
|
cpu_physical_memory_read(addr, (uint8_t *)&v, 4);
|
|
if (value & 1)
|
|
v |= mask;
|
|
else
|
|
v &= ~mask;
|
|
cpu_physical_memory_write(addr, (uint8_t *)&v, 4);
|
|
}
|
|
|
|
static const MemoryRegionOps bitband_ops = {
|
|
.old_mmio = {
|
|
.read = { bitband_readb, bitband_readw, bitband_readl, },
|
|
.write = { bitband_writeb, bitband_writew, bitband_writel, },
|
|
},
|
|
.endianness = DEVICE_NATIVE_ENDIAN,
|
|
};
|
|
|
|
typedef struct {
|
|
SysBusDevice busdev;
|
|
MemoryRegion iomem;
|
|
uint32_t base;
|
|
} BitBandState;
|
|
|
|
static int bitband_init(SysBusDevice *dev)
|
|
{
|
|
BitBandState *s = FROM_SYSBUS(BitBandState, dev);
|
|
|
|
memory_region_init_io(&s->iomem, &bitband_ops, &s->base, "bitband",
|
|
0x02000000);
|
|
sysbus_init_mmio(dev, &s->iomem);
|
|
return 0;
|
|
}
|
|
|
|
static void armv7m_bitband_init(void)
|
|
{
|
|
DeviceState *dev;
|
|
|
|
dev = qdev_create(NULL, "ARM,bitband-memory");
|
|
qdev_prop_set_uint32(dev, "base", 0x20000000);
|
|
qdev_init_nofail(dev);
|
|
sysbus_mmio_map(sysbus_from_qdev(dev), 0, 0x22000000);
|
|
|
|
dev = qdev_create(NULL, "ARM,bitband-memory");
|
|
qdev_prop_set_uint32(dev, "base", 0x40000000);
|
|
qdev_init_nofail(dev);
|
|
sysbus_mmio_map(sysbus_from_qdev(dev), 0, 0x42000000);
|
|
}
|
|
|
|
/* Board init. */
|
|
|
|
static void armv7m_reset(void *opaque)
|
|
{
|
|
ARMCPU *cpu = opaque;
|
|
|
|
cpu_reset(CPU(cpu));
|
|
}
|
|
|
|
/* Init CPU and memory for a v7-M based board.
|
|
flash_size and sram_size are in kb.
|
|
Returns the NVIC array. */
|
|
|
|
qemu_irq *armv7m_init(MemoryRegion *address_space_mem,
|
|
int flash_size, int sram_size,
|
|
const char *kernel_filename, const char *cpu_model)
|
|
{
|
|
ARMCPU *cpu;
|
|
CPUARMState *env;
|
|
DeviceState *nvic;
|
|
/* FIXME: make this local state. */
|
|
static qemu_irq pic[64];
|
|
qemu_irq *cpu_pic;
|
|
int image_size;
|
|
uint64_t entry;
|
|
uint64_t lowaddr;
|
|
int i;
|
|
int big_endian;
|
|
MemoryRegion *sram = g_new(MemoryRegion, 1);
|
|
MemoryRegion *flash = g_new(MemoryRegion, 1);
|
|
MemoryRegion *hack = g_new(MemoryRegion, 1);
|
|
|
|
flash_size *= 1024;
|
|
sram_size *= 1024;
|
|
|
|
if (cpu_model == NULL) {
|
|
cpu_model = "cortex-m3";
|
|
}
|
|
cpu = cpu_arm_init(cpu_model);
|
|
if (cpu == NULL) {
|
|
fprintf(stderr, "Unable to find CPU definition\n");
|
|
exit(1);
|
|
}
|
|
env = &cpu->env;
|
|
|
|
#if 0
|
|
/* > 32Mb SRAM gets complicated because it overlaps the bitband area.
|
|
We don't have proper commandline options, so allocate half of memory
|
|
as SRAM, up to a maximum of 32Mb, and the rest as code. */
|
|
if (ram_size > (512 + 32) * 1024 * 1024)
|
|
ram_size = (512 + 32) * 1024 * 1024;
|
|
sram_size = (ram_size / 2) & TARGET_PAGE_MASK;
|
|
if (sram_size > 32 * 1024 * 1024)
|
|
sram_size = 32 * 1024 * 1024;
|
|
code_size = ram_size - sram_size;
|
|
#endif
|
|
|
|
/* Flash programming is done via the SCU, so pretend it is ROM. */
|
|
memory_region_init_ram(flash, "armv7m.flash", flash_size);
|
|
vmstate_register_ram_global(flash);
|
|
memory_region_set_readonly(flash, true);
|
|
memory_region_add_subregion(address_space_mem, 0, flash);
|
|
memory_region_init_ram(sram, "armv7m.sram", sram_size);
|
|
vmstate_register_ram_global(sram);
|
|
memory_region_add_subregion(address_space_mem, 0x20000000, sram);
|
|
armv7m_bitband_init();
|
|
|
|
nvic = qdev_create(NULL, "armv7m_nvic");
|
|
env->nvic = nvic;
|
|
qdev_init_nofail(nvic);
|
|
cpu_pic = arm_pic_init_cpu(cpu);
|
|
sysbus_connect_irq(sysbus_from_qdev(nvic), 0, cpu_pic[ARM_PIC_CPU_IRQ]);
|
|
for (i = 0; i < 64; i++) {
|
|
pic[i] = qdev_get_gpio_in(nvic, i);
|
|
}
|
|
|
|
#ifdef TARGET_WORDS_BIGENDIAN
|
|
big_endian = 1;
|
|
#else
|
|
big_endian = 0;
|
|
#endif
|
|
|
|
if (!kernel_filename) {
|
|
fprintf(stderr, "Guest image must be specified (using -kernel)\n");
|
|
exit(1);
|
|
}
|
|
|
|
image_size = load_elf(kernel_filename, NULL, NULL, &entry, &lowaddr,
|
|
NULL, big_endian, ELF_MACHINE, 1);
|
|
if (image_size < 0) {
|
|
image_size = load_image_targphys(kernel_filename, 0, flash_size);
|
|
lowaddr = 0;
|
|
}
|
|
if (image_size < 0) {
|
|
fprintf(stderr, "qemu: could not load kernel '%s'\n",
|
|
kernel_filename);
|
|
exit(1);
|
|
}
|
|
|
|
/* Hack to map an additional page of ram at the top of the address
|
|
space. This stops qemu complaining about executing code outside RAM
|
|
when returning from an exception. */
|
|
memory_region_init_ram(hack, "armv7m.hack", 0x1000);
|
|
vmstate_register_ram_global(hack);
|
|
memory_region_add_subregion(address_space_mem, 0xfffff000, hack);
|
|
|
|
qemu_register_reset(armv7m_reset, cpu);
|
|
return pic;
|
|
}
|
|
|
|
static Property bitband_properties[] = {
|
|
DEFINE_PROP_UINT32("base", BitBandState, base, 0),
|
|
DEFINE_PROP_END_OF_LIST(),
|
|
};
|
|
|
|
static void bitband_class_init(ObjectClass *klass, void *data)
|
|
{
|
|
DeviceClass *dc = DEVICE_CLASS(klass);
|
|
SysBusDeviceClass *k = SYS_BUS_DEVICE_CLASS(klass);
|
|
|
|
k->init = bitband_init;
|
|
dc->props = bitband_properties;
|
|
}
|
|
|
|
static TypeInfo bitband_info = {
|
|
.name = "ARM,bitband-memory",
|
|
.parent = TYPE_SYS_BUS_DEVICE,
|
|
.instance_size = sizeof(BitBandState),
|
|
.class_init = bitband_class_init,
|
|
};
|
|
|
|
static void armv7m_register_types(void)
|
|
{
|
|
type_register_static(&bitband_info);
|
|
}
|
|
|
|
type_init(armv7m_register_types)
|