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Re: [PATCH v2 1/3] riscv: Unify Qemu's reset vector code path
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From: |
Alistair Francis |
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Subject: |
Re: [PATCH v2 1/3] riscv: Unify Qemu's reset vector code path |
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Date: |
Thu, 25 Jun 2020 12:40:21 -0700 |
On Thu, Jun 25, 2020 at 11:38 AM Atish Patra <atish.patra@wdc.com> wrote:
>
> Currently, all riscv machines except sifive_u have identical reset vector
> code implementations with memory addresses being different for all machines.
> They can be easily combined into a single function in common code.
>
> Move it to common function and let all the machines use the common function.
>
> Signed-off-by: Atish Patra <atish.patra@wdc.com>
> ---
> hw/riscv/boot.c | 46 +++++++++++++++++++++++++++++++++++++++++
> hw/riscv/spike.c | 38 +++-------------------------------
> hw/riscv/virt.c | 37 +++------------------------------
> include/hw/riscv/boot.h | 2 ++
> 4 files changed, 54 insertions(+), 69 deletions(-)
>
> diff --git a/hw/riscv/boot.c b/hw/riscv/boot.c
> index adb421b91b68..8ed96da600c9 100644
> --- a/hw/riscv/boot.c
> +++ b/hw/riscv/boot.c
> @@ -22,12 +22,16 @@
> #include "qemu/units.h"
> #include "qemu/error-report.h"
> #include "exec/cpu-defs.h"
> +#include "exec/address-spaces.h"
> #include "hw/boards.h"
> #include "hw/loader.h"
> #include "hw/riscv/boot.h"
> #include "elf.h"
> +#include "sysemu/device_tree.h"
> #include "sysemu/qtest.h"
>
> +#include <libfdt.h>
> +
Do you mind removing these header from the original files, we
shouldn't need them now.
Besides that:
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Alistair
> #if defined(TARGET_RISCV32)
> # define KERNEL_BOOT_ADDRESS 0x80400000
> #else
> @@ -155,3 +159,45 @@ hwaddr riscv_load_initrd(const char *filename, uint64_t
> mem_size,
>
> return *start + size;
> }
> +
> +void riscv_setup_rom_reset_vec(hwaddr start_addr, hwaddr rom_base,
> + hwaddr rom_size, void *fdt)
> +{
> + int i;
> + /* reset vector */
> + uint32_t reset_vec[8] = {
> + 0x00000297, /* 1: auipc t0, %pcrel_hi(dtb) */
> + 0x02028593, /* addi a1, t0, %pcrel_lo(1b) */
> + 0xf1402573, /* csrr a0, mhartid */
> +#if defined(TARGET_RISCV32)
> + 0x0182a283, /* lw t0, 24(t0) */
> +#elif defined(TARGET_RISCV64)
> + 0x0182b283, /* ld t0, 24(t0) */
> +#endif
> + 0x00028067, /* jr t0 */
> + 0x00000000,
> + start_addr, /* start: .dword */
> + 0x00000000,
> + /* dtb: */
> + };
> +
> + /* copy in the reset vector in little_endian byte order */
> + for (i = 0; i < sizeof(reset_vec) >> 2; i++) {
> + reset_vec[i] = cpu_to_le32(reset_vec[i]);
> + }
> + rom_add_blob_fixed_as("mrom.reset", reset_vec, sizeof(reset_vec),
> + rom_base, &address_space_memory);
> +
> + /* copy in the device tree */
> + if (fdt_pack(fdt) || fdt_totalsize(fdt) >
> + rom_size - sizeof(reset_vec)) {
> + error_report("not enough space to store device-tree");
> + exit(1);
> + }
> + qemu_fdt_dumpdtb(fdt, fdt_totalsize(fdt));
> + rom_add_blob_fixed_as("mrom.fdt", fdt, fdt_totalsize(fdt),
> + rom_base + sizeof(reset_vec),
> + &address_space_memory);
> +
> + return;
> +}
> diff --git a/hw/riscv/spike.c b/hw/riscv/spike.c
> index 3c87e04fdceb..561642c1fb5d 100644
> --- a/hw/riscv/spike.c
> +++ b/hw/riscv/spike.c
> @@ -165,7 +165,6 @@ static void spike_board_init(MachineState *machine)
> MemoryRegion *system_memory = get_system_memory();
> MemoryRegion *main_mem = g_new(MemoryRegion, 1);
> MemoryRegion *mask_rom = g_new(MemoryRegion, 1);
> - int i;
> unsigned int smp_cpus = machine->smp.cpus;
>
> /* Initialize SOC */
> @@ -212,40 +211,9 @@ static void spike_board_init(MachineState *machine)
> }
> }
>
> - /* reset vector */
> - uint32_t reset_vec[8] = {
> - 0x00000297, /* 1: auipc t0, %pcrel_hi(dtb) */
> - 0x02028593, /* addi a1, t0, %pcrel_lo(1b) */
> - 0xf1402573, /* csrr a0, mhartid */
> -#if defined(TARGET_RISCV32)
> - 0x0182a283, /* lw t0, 24(t0) */
> -#elif defined(TARGET_RISCV64)
> - 0x0182b283, /* ld t0, 24(t0) */
> -#endif
> - 0x00028067, /* jr t0 */
> - 0x00000000,
> - memmap[SPIKE_DRAM].base, /* start: .dword DRAM_BASE */
> - 0x00000000,
> - /* dtb: */
> - };
> -
> - /* copy in the reset vector in little_endian byte order */
> - for (i = 0; i < sizeof(reset_vec) >> 2; i++) {
> - reset_vec[i] = cpu_to_le32(reset_vec[i]);
> - }
> - rom_add_blob_fixed_as("mrom.reset", reset_vec, sizeof(reset_vec),
> - memmap[SPIKE_MROM].base, &address_space_memory);
> -
> - /* copy in the device tree */
> - if (fdt_pack(s->fdt) || fdt_totalsize(s->fdt) >
> - memmap[SPIKE_MROM].size - sizeof(reset_vec)) {
> - error_report("not enough space to store device-tree");
> - exit(1);
> - }
> - qemu_fdt_dumpdtb(s->fdt, fdt_totalsize(s->fdt));
> - rom_add_blob_fixed_as("mrom.fdt", s->fdt, fdt_totalsize(s->fdt),
> - memmap[SPIKE_MROM].base + sizeof(reset_vec),
> - &address_space_memory);
> + /* load the reset vector */
> + riscv_setup_rom_reset_vec(memmap[SPIKE_DRAM].base,
> memmap[SPIKE_MROM].base,
> + memmap[SPIKE_MROM].size, s->fdt);
>
> /* initialize HTIF using symbols found in load_kernel */
> htif_mm_init(system_memory, mask_rom, &s->soc.harts[0].env,
> serial_hd(0));
> diff --git a/hw/riscv/virt.c b/hw/riscv/virt.c
> index 616db6f5aced..22a60259daab 100644
> --- a/hw/riscv/virt.c
> +++ b/hw/riscv/virt.c
> @@ -535,40 +535,9 @@ static void virt_machine_init(MachineState *machine)
> start_addr = virt_memmap[VIRT_FLASH].base;
> }
>
> - /* reset vector */
> - uint32_t reset_vec[8] = {
> - 0x00000297, /* 1: auipc t0, %pcrel_hi(dtb) */
> - 0x02028593, /* addi a1, t0, %pcrel_lo(1b) */
> - 0xf1402573, /* csrr a0, mhartid */
> -#if defined(TARGET_RISCV32)
> - 0x0182a283, /* lw t0, 24(t0) */
> -#elif defined(TARGET_RISCV64)
> - 0x0182b283, /* ld t0, 24(t0) */
> -#endif
> - 0x00028067, /* jr t0 */
> - 0x00000000,
> - start_addr, /* start: .dword */
> - 0x00000000,
> - /* dtb: */
> - };
> -
> - /* copy in the reset vector in little_endian byte order */
> - for (i = 0; i < sizeof(reset_vec) >> 2; i++) {
> - reset_vec[i] = cpu_to_le32(reset_vec[i]);
> - }
> - rom_add_blob_fixed_as("mrom.reset", reset_vec, sizeof(reset_vec),
> - memmap[VIRT_MROM].base, &address_space_memory);
> -
> - /* copy in the device tree */
> - if (fdt_pack(s->fdt) || fdt_totalsize(s->fdt) >
> - memmap[VIRT_MROM].size - sizeof(reset_vec)) {
> - error_report("not enough space to store device-tree");
> - exit(1);
> - }
> - qemu_fdt_dumpdtb(s->fdt, fdt_totalsize(s->fdt));
> - rom_add_blob_fixed_as("mrom.fdt", s->fdt, fdt_totalsize(s->fdt),
> - memmap[VIRT_MROM].base + sizeof(reset_vec),
> - &address_space_memory);
> + /* load the reset vector */
> + riscv_setup_rom_reset_vec(start_addr, virt_memmap[VIRT_MROM].base,
> + virt_memmap[VIRT_MROM].size, s->fdt);
>
> /* create PLIC hart topology configuration string */
> plic_hart_config_len = (strlen(VIRT_PLIC_HART_CONFIG) + 1) * smp_cpus;
> diff --git a/include/hw/riscv/boot.h b/include/hw/riscv/boot.h
> index 9daa98da08d7..3e9759c89aa2 100644
> --- a/include/hw/riscv/boot.h
> +++ b/include/hw/riscv/boot.h
> @@ -35,5 +35,7 @@ target_ulong riscv_load_kernel(const char *kernel_filename,
> symbol_fn_t sym_cb);
> hwaddr riscv_load_initrd(const char *filename, uint64_t mem_size,
> uint64_t kernel_entry, hwaddr *start);
> +void riscv_setup_rom_reset_vec(hwaddr saddr, hwaddr rom_base,
> + hwaddr rom_size, void *fdt);
>
> #endif /* RISCV_BOOT_H */
> --
> 2.26.2
>
>