auto import from //depot/cupcake/@135843

1 files changed, 206 insertions, 0 deletions

diff --git a/hw/armv7m.c b/hw/armv7m.c
new file mode 100644
index 0000000..b2bad3c
--- /dev/null
+++ b/hw/armv7m.c
@@ -0,0 +1,206 @@
+/*
+ * ARMV7M System emulation.
+ *
+ * Copyright (c) 2006-2007 CodeSourcery.
+ * Written by Paul Brook
+ *
+ * This code is licenced under the GPL.
+ */
+
+#include "hw.h"
+#include "arm-misc.h"
+#include "sysemu.h"
+
+/* Bitbanded IO.  Each word corresponds to a single bit.  */
+
+/* Get the byte address of the real memory for a bitband acess.  */
+static inline uint32_t bitband_addr(uint32_t addr)
+{
+    uint32_t res;
+
+    res = addr & 0xe0000000;
+    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(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(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(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(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(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(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 CPUReadMemoryFunc *bitband_readfn[] = {
+   bitband_readb,
+   bitband_readw,
+   bitband_readl
+};
+
+static CPUWriteMemoryFunc *bitband_writefn[] = {
+   bitband_writeb,
+   bitband_writew,
+   bitband_writel
+};
+
+static void armv7m_bitband_init(void)
+{
+    int iomemtype;
+
+    iomemtype = cpu_register_io_memory(0, bitband_readfn, bitband_writefn,
+                                       NULL);
+    cpu_register_physical_memory(0x22000000, 0x02000000, iomemtype);
+    cpu_register_physical_memory(0x42000000, 0x02000000, iomemtype);
+}
+
+/* Board init.  */
+/* 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(int flash_size, int sram_size,
+                      const char *kernel_filename, const char *cpu_model)
+{
+    CPUState *env;
+    qemu_irq *pic;
+    uint32_t pc;
+    int image_size;
+    uint64_t entry;
+    uint64_t lowaddr;
+
+    flash_size *= 1024;
+    sram_size *= 1024;
+
+    if (!cpu_model)
+	cpu_model = "cortex-m3";
+    env = cpu_init(cpu_model);
+    if (!env) {
+        fprintf(stderr, "Unable to find CPU definition\n");
+        exit(1);
+    }
+
+#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.  */
+    cpu_register_physical_memory(0, flash_size, IO_MEM_ROM);
+    cpu_register_physical_memory(0x20000000, sram_size,
+                                 flash_size + IO_MEM_RAM);
+    armv7m_bitband_init();
+
+    pic = armv7m_nvic_init(env);
+
+    image_size = load_elf(kernel_filename, 0, &entry, &lowaddr, NULL);
+    if (image_size < 0) {
+        image_size = load_image(kernel_filename, phys_ram_base);
+	lowaddr = 0;
+    }
+    if (image_size < 0) {
+        fprintf(stderr, "qemu: could not load kernel '%s'\n",
+                kernel_filename);
+        exit(1);
+    }
+
+    /* If the image was loaded at address zero then assume it is a
+       regular ROM image and perform the normal CPU reset sequence.
+       Otherwise jump directly to the entry point.  */
+    if (lowaddr == 0) {
+	env->regs[13] = tswap32(*(uint32_t *)phys_ram_base);
+	pc = tswap32(*(uint32_t *)(phys_ram_base + 4));
+    } else {
+	pc = entry;
+    }
+    env->thumb = pc & 1;
+    env->regs[15] = pc & ~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.  */
+    cpu_register_physical_memory(0xfffff000, 0x1000, IO_MEM_RAM + ram_size);
+
+    return pic;
+}
+