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Re: [PATCH v2 1/3] riscv: Unify Qemu's reset vector code path


From: Atish Patra
Subject: Re: [PATCH v2 1/3] riscv: Unify Qemu's reset vector code path
Date: Thu, 25 Jun 2020 13:08:42 -0700

On Thu, Jun 25, 2020 at 12:50 PM Alistair Francis <alistair23@gmail.com> wrote:
>
> 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.
>

Sure. I will do that.

> 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
> >
> >
>


-- 
Regards,
Atish



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