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Re: [Qemu-devel] [PATCH v3 5/7] leon3: add a little bootloader
From: |
Philippe Mathieu-Daudé |
Subject: |
Re: [Qemu-devel] [PATCH v3 5/7] leon3: add a little bootloader |
Date: |
Fri, 17 May 2019 12:27:37 +0200 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.6.1 |
On 5/15/19 2:31 PM, KONRAD Frederic wrote:
> This adds a little bootloader to the leon3_machine when a ram image is
> given through the kernel parameter and no bios are provided:
> * The UART transmiter is enabled.
> * The TIMER is initialized.
>
> Reviewed-by: Fabien Chouteau <address@hidden>
> Reviewed-by: Philippe Mathieu-Daudé <address@hidden>
> Signed-off-by: KONRAD Frederic <address@hidden>
Tested-by: Philippe Mathieu-Daudé <address@hidden>
> ---
> hw/sparc/leon3.c | 79
> ++++++++++++++++++++++++++++++++++++++++++++++++++------
> 1 file changed, 71 insertions(+), 8 deletions(-)
>
> diff --git a/hw/sparc/leon3.c b/hw/sparc/leon3.c
> index 4f58691..6ba63e6 100644
> --- a/hw/sparc/leon3.c
> +++ b/hw/sparc/leon3.c
> @@ -44,6 +44,8 @@
> #define CPU_CLK (40 * 1000 * 1000)
>
> #define LEON3_PROM_FILENAME "u-boot.bin"
> +#define LEON3_PROM_OFFSET (0x00000000)
> +#define LEON3_RAM_OFFSET (0x40000000)
>
> #define MAX_PILS 16
>
> @@ -62,6 +64,59 @@ typedef struct ResetData {
> target_ulong sp; /* initial stack pointer */
> } ResetData;
>
> +static uint32_t *gen_store_u32(uint32_t *code, hwaddr addr, uint32_t val)
> +{
> + stl_p(code++, 0x82100000); /* mov %g0, %g1 */
> + stl_p(code++, 0x84100000); /* mov %g0, %g2 */
> + stl_p(code++, 0x03000000 +
> + extract32(addr, 10, 22));
> + /* sethi %hi(addr), %g1 */
> + stl_p(code++, 0x82106000 +
> + extract32(addr, 0, 10));
> + /* or %g1, addr, %g1 */
> + stl_p(code++, 0x05000000 +
> + extract32(val, 10, 22));
> + /* sethi %hi(val), %g2 */
> + stl_p(code++, 0x8410a000 +
> + extract32(val, 0, 10));
> + /* or %g2, val, %g2 */
> + stl_p(code++, 0xc4204000); /* st %g2, [ %g1 ] */
> +
> + return code;
> +}
> +
> +/*
> + * When loading a kernel in RAM the machine is expected to be in a different
> + * state (eg: initialized by the bootloader). This little code reproduces
> + * this behavior.
> + */
> +static void write_bootloader(CPUSPARCState *env, uint8_t *base,
> + hwaddr kernel_addr)
> +{
> + uint32_t *p = (uint32_t *) base;
> +
> + /* Initialize the UARTs */
> + /* *UART_CONTROL = UART_RECEIVE_ENABLE | UART_TRANSMIT_ENABLE; */
> + p = gen_store_u32(p, 0x80000108, 3);
> +
> + /* Initialize the TIMER 0 */
> + /* *GPTIMER_SCALER_RELOAD = 40 - 1; */
> + p = gen_store_u32(p, 0x80000304, 39);
> + /* *GPTIMER0_COUNTER_RELOAD = 0xFFFE; */
> + p = gen_store_u32(p, 0x80000314, 0xFFFFFFFE);
> + /* *GPTIMER0_CONFIG = GPTIMER_ENABLE | GPTIMER_RESTART; */
> + p = gen_store_u32(p, 0x80000318, 3);
> +
> + /* JUMP to the entry point */
> + stl_p(p++, 0x82100000); /* mov %g0, %g1 */
> + stl_p(p++, 0x03000000 + extract32(kernel_addr, 10, 22));
> + /* sethi %hi(kernel_addr), %g1 */
> + stl_p(p++, 0x82106000 + extract32(kernel_addr, 0, 10));
> + /* or kernel_addr, %g1 */
> + stl_p(p++, 0x81c04000); /* jmp %g1 */
> + stl_p(p++, 0x01000000); /* nop */
> +}
> +
> static void main_cpu_reset(void *opaque)
> {
> ResetData *s = (ResetData *)opaque;
> @@ -142,7 +197,7 @@ static void leon3_generic_hw_init(MachineState *machine)
> /* Reset data */
> reset_info = g_malloc0(sizeof(ResetData));
> reset_info->cpu = cpu;
> - reset_info->sp = 0x40000000 + ram_size;
> + reset_info->sp = LEON3_RAM_OFFSET + ram_size;
> qemu_register_reset(main_cpu_reset, reset_info);
>
> /* Allocate IRQ manager */
> @@ -164,13 +219,13 @@ static void leon3_generic_hw_init(MachineState *machine)
> }
>
> memory_region_allocate_system_memory(ram, NULL, "leon3.ram", ram_size);
> - memory_region_add_subregion(address_space_mem, 0x40000000, ram);
> + memory_region_add_subregion(address_space_mem, LEON3_RAM_OFFSET, ram);
>
> /* Allocate BIOS */
> prom_size = 8 * MiB;
> memory_region_init_ram(prom, NULL, "Leon3.bios", prom_size,
> &error_fatal);
> memory_region_set_readonly(prom, true);
> - memory_region_add_subregion(address_space_mem, 0x00000000, prom);
> + memory_region_add_subregion(address_space_mem, LEON3_PROM_OFFSET, prom);
>
> /* Load boot prom */
> if (bios_name == NULL) {
> @@ -190,7 +245,7 @@ static void leon3_generic_hw_init(MachineState *machine)
> }
>
> if (bios_size > 0) {
> - ret = load_image_targphys(filename, 0x00000000, bios_size);
> + ret = load_image_targphys(filename, LEON3_PROM_OFFSET, bios_size);
> if (ret < 0 || ret > prom_size) {
> error_report("could not load prom '%s'", filename);
> exit(1);
> @@ -220,10 +275,18 @@ static void leon3_generic_hw_init(MachineState *machine)
> exit(1);
> }
> if (bios_size <= 0) {
> - /* If there is no bios/monitor, start the application. */
> - env->pc = entry;
> - env->npc = entry + 4;
> - reset_info->entry = entry;
> + /*
> + * If there is no bios/monitor just start the application but put
> + * the machine in an initialized state through a little
> + * bootloader.
> + */
> + uint8_t *bootloader_entry;
> +
> + bootloader_entry = memory_region_get_ram_ptr(prom);
> + write_bootloader(env, bootloader_entry, entry);
> + env->pc = LEON3_PROM_OFFSET;
> + env->npc = LEON3_PROM_OFFSET + 4;
> + reset_info->entry = LEON3_PROM_OFFSET;
> }
> }
>
>
- [Qemu-devel] [PATCH v3 0/7] Leon3 patches, KONRAD Frederic, 2019/05/15
- [Qemu-devel] [PATCH v3 1/7] leon3: fix the error message when no bios are provided, KONRAD Frederic, 2019/05/15
- [Qemu-devel] [PATCH v3 7/7] MAINTAINERS: add myself for leon3, KONRAD Frederic, 2019/05/15
- [Qemu-devel] [PATCH v3 4/7] grlib, apbuart: get rid of the old-style create function, KONRAD Frederic, 2019/05/15
- [Qemu-devel] [PATCH v3 3/7] grlib, gptimer: get rid of the old-style create function, KONRAD Frederic, 2019/05/15
- [Qemu-devel] [PATCH v3 6/7] leon3: introduce the plug and play mechanism, KONRAD Frederic, 2019/05/15
- [Qemu-devel] [PATCH v3 5/7] leon3: add a little bootloader, KONRAD Frederic, 2019/05/15
- Re: [Qemu-devel] [PATCH v3 5/7] leon3: add a little bootloader,
Philippe Mathieu-Daudé <=
- [Qemu-devel] [PATCH v3 2/7] grlib, irqmp: get rid of the old-style create function, KONRAD Frederic, 2019/05/15
- Re: [Qemu-devel] [PATCH v3 0/7] Leon3 patches, Mark Cave-Ayland, 2019/05/17