|
| From: | Alistair Francis |
| Subject: | Re: [PATCH v7 08/11] RISC-V: Add auxiliary files |
| Date: | Wed, 13 Feb 2019 00:48:44 +0000 |
On Tue, 2019-02-12 at 17:32 +0100, Alexander Graf wrote:
> To support a new architecture we need to provide a few helper
> functions
> for memory, cache, timer, etc support.
>
> This patch adds the remainders of those. Some bits are still
> disabled,
> as I couldn't guarantee that we're always running on models / in
> modes
> where the respective hardware is available.
>
> Signed-off-by: Alexander Graf <address@hidden>
Reviewed-by: Alistair Francis <address@hidden>
Alistair
>
> ---
>
> v2 -> v3:
>
> - Fix riscv32 target
>
> v3 -> v4:
>
> - Change copyright from 2013 to 2018
> - Fix coding style
> - Resurrect time reading code
> - Add fence.i for icache flush
>
> v4 -> v5:
>
> - Mark grub_arch_sync_dma_caches args as unused
> - Whitespace fix
>
> v6 -> v7:
>
> - Fix cast on riscv32
> ---
> grub-core/kern/riscv/cache.c | 63
> +++++++++++++++++++++++++++++++
> grub-core/kern/riscv/cache_flush.S | 44 ++++++++++++++++++++++
> grub-core/kern/riscv/efi/init.c | 76
> ++++++++++++++++++++++++++++++++++++++
> include/grub/riscv32/efi/memory.h | 6 +++
> include/grub/riscv32/time.h | 28 ++++++++++++++
> include/grub/riscv32/types.h | 34 +++++++++++++++++
> include/grub/riscv64/efi/memory.h | 6 +++
> include/grub/riscv64/time.h | 28 ++++++++++++++
> include/grub/riscv64/types.h | 34 +++++++++++++++++
> 9 files changed, 319 insertions(+)
> create mode 100644 grub-core/kern/riscv/cache.c
> create mode 100644 grub-core/kern/riscv/cache_flush.S
> create mode 100644 grub-core/kern/riscv/efi/init.c
> create mode 100644 include/grub/riscv32/efi/memory.h
> create mode 100644 include/grub/riscv32/time.h
> create mode 100644 include/grub/riscv32/types.h
> create mode 100644 include/grub/riscv64/efi/memory.h
> create mode 100644 include/grub/riscv64/time.h
> create mode 100644 include/grub/riscv64/types.h
>
> diff --git a/grub-core/kern/riscv/cache.c b/grub-
> core/kern/riscv/cache.c
> new file mode 100644
> index 000000000..47777a033
> --- /dev/null
> +++ b/grub-core/kern/riscv/cache.c
> @@ -0,0 +1,63 @@
> +/*
> + * GRUB -- GRand Unified Bootloader
> + * Copyright (C) 2018 Free Software Foundation, Inc.
> + *
> + * GRUB is free software: you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License as
> published by
> + * the Free Software Foundation, either version 3 of the License,
> or
> + * (at your option) any later version.
> + *
> + * GRUB is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> + * GNU General Public License for more details.
> + *
> + * You should have received a copy of the GNU General Public
> License
> + * along with GRUB. If not, see <http://www.gnu.org/licenses/>;.
> + */
> +
> +#include <grub/cache.h>
> +#include <grub/misc.h>
> +
> +static grub_int64_t dlinesz;
> +static grub_int64_t ilinesz;
> +
> +/* Prototypes for asm functions. */
> +void grub_arch_clean_dcache_range (grub_addr_t beg, grub_addr_t end,
> + grub_size_t line_size);
> +void grub_arch_invalidate_icache_range (grub_addr_t beg, grub_addr_t
> end,
> + grub_size_t line_size);
> +
> +static void
> +probe_caches (void)
> +{
> + /* TODO */
> + dlinesz = 32;
> + ilinesz = 32;
> +}
> +
> +void
> +grub_arch_sync_caches (void *address, grub_size_t len)
> +{
> + grub_size_t start, end, max_align;
> +
> + if (dlinesz == 0)
> + probe_caches();
> + if (dlinesz == 0)
> + grub_fatal ("Unknown cache line size!");
> +
> + max_align = dlinesz > ilinesz ? dlinesz : ilinesz;
> +
> + start = ALIGN_DOWN ((grub_size_t) address, max_align);
> + end = ALIGN_UP ((grub_size_t) address + len, max_align);
> +
> + grub_arch_clean_dcache_range (start, end, dlinesz);
> + grub_arch_invalidate_icache_range (start, end, ilinesz);
> +}
> +
> +void
> +grub_arch_sync_dma_caches (volatile void *address
> __attribute__((unused)),
> + grub_size_t len __attribute__((unused)))
> +{
> + /* DMA incoherent devices not supported yet */
> +}
> diff --git a/grub-core/kern/riscv/cache_flush.S b/grub-
> core/kern/riscv/cache_flush.S
> new file mode 100644
> index 000000000..41de6e411
> --- /dev/null
> +++ b/grub-core/kern/riscv/cache_flush.S
> @@ -0,0 +1,44 @@
> +/*
> + * GRUB -- GRand Unified Bootloader
> + * Copyright (C) 2018 Free Software Foundation, Inc.
> + *
> + * GRUB is free software: you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License as
> published by
> + * the Free Software Foundation, either version 3 of the License,
> or
> + * (at your option) any later version.
> + *
> + * GRUB is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> + * GNU General Public License for more details.
> + *
> + * You should have received a copy of the GNU General Public
> License
> + * along with GRUB. If not, see <http://www.gnu.org/licenses/>;.
> + */
> +
> +#include <grub/symbol.h>
> +
> + .file "cache_flush.S"
> + .text
> +
> +/*
> + * Simple cache maintenance functions
> + */
> +
> +/*
> + * a0 - *beg (inclusive)
> + * a1 - *end (exclusive)
> + * a2 - line size
> +*/
> +FUNCTION(grub_arch_clean_dcache_range)
> + /* TODO */
> + ret
> +
> +/*
> + * a0 - *beg (inclusive)
> + * a1 - *end (exclusive)
> + * a2 - line size
> + */
> +FUNCTION(grub_arch_invalidate_icache_range)
> + fence.i
> + ret
> diff --git a/grub-core/kern/riscv/efi/init.c b/grub-
> core/kern/riscv/efi/init.c
> new file mode 100644
> index 000000000..7eb1969d0
> --- /dev/null
> +++ b/grub-core/kern/riscv/efi/init.c
> @@ -0,0 +1,76 @@
> +/* init.c - initialize a riscv-based EFI system */
> +/*
> + * GRUB -- GRand Unified Bootloader
> + * Copyright (C) 2018 Free Software Foundation, Inc.
> + *
> + * GRUB is free software: you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License as
> published by
> + * the Free Software Foundation, either version 3 of the License,
> or
> + * (at your option) any later version.
> + *
> + * GRUB is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> + * GNU General Public License for more details.
> + *
> + * You should have received a copy of the GNU General Public
> License
> + * along with GRUB. If not, see <http://www.gnu.org/licenses/>;.
> + */
> +
> +#include <grub/env.h>
> +#include <grub/kernel.h>
> +#include <grub/misc.h>
> +#include <grub/mm.h>
> +#include <grub/time.h>
> +#include <grub/efi/efi.h>
> +#include <grub/loader.h>
> +
> +static grub_uint64_t timer_frequency_in_khz;
> +
> +static grub_uint64_t
> +grub_efi_get_time_ms (void)
> +{
> + grub_uint64_t tmr;
> +
> +#if __riscv_xlen == 64
> + asm volatile ("rdcycle %0" : "=r" (tmr));
> +#else
> + grub_uint32_t lo, hi, tmp;
> + asm volatile (
> + "1:\n"
> + "rdcycleh %0\n"
> + "rdcycle %1\n"
> + "rdcycleh %2\n"
> + "bne %0, %2, 1b"
> + : "=&r" (hi), "=&r" (lo), "=&r" (tmp));
> + tmr = ((grub_uint64_t)hi << 32) | lo;
> +#endif
> +
> + return tmr / timer_frequency_in_khz;
> +}
> +
> +void
> +grub_machine_init (void)
> +{
> + grub_uint64_t time_before, time_after;
> +
> + grub_efi_init ();
> +
> + /* Calculate timer frequency */
> + timer_frequency_in_khz = 1;
> + time_before = grub_efi_get_time_ms();
> + grub_efi_stall(1000);
> + time_after = grub_efi_get_time_ms();
> + timer_frequency_in_khz = time_after - time_before;
> +
> + grub_install_get_time_ms (grub_efi_get_time_ms);
> +}
> +
> +void
> +grub_machine_fini (int flags)
> +{
> + if (!(flags & GRUB_LOADER_FLAG_NORETURN))
> + return;
> +
> + grub_efi_fini ();
> +}
> diff --git a/include/grub/riscv32/efi/memory.h
> b/include/grub/riscv32/efi/memory.h
> new file mode 100644
> index 000000000..e61c474ff
> --- /dev/null
> +++ b/include/grub/riscv32/efi/memory.h
> @@ -0,0 +1,6 @@
> +#ifndef GRUB_MEMORY_CPU_HEADER
> +#include <grub/efi/memory.h>
> +
> +#define GRUB_EFI_MAX_USABLE_ADDRESS 0xffffffffUL
> +
> +#endif /* ! GRUB_MEMORY_CPU_HEADER */
> diff --git a/include/grub/riscv32/time.h
> b/include/grub/riscv32/time.h
> new file mode 100644
> index 000000000..20abd648b
> --- /dev/null
> +++ b/include/grub/riscv32/time.h
> @@ -0,0 +1,28 @@
> +/*
> + * GRUB -- GRand Unified Bootloader
> + * Copyright (C) 2018 Free Software Foundation, Inc.
> + *
> + * GRUB is free software: you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License as
> published by
> + * the Free Software Foundation, either version 3 of the License,
> or
> + * (at your option) any later version.
> + *
> + * GRUB is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> + * GNU General Public License for more details.
> + *
> + * You should have received a copy of the GNU General Public
> License
> + * along with GRUB. If not, see <http://www.gnu.org/licenses/>;.
> + */
> +
> +#ifndef KERNEL_CPU_TIME_HEADER
> +#define KERNEL_CPU_TIME_HEADER 1
> +
> +static __inline void
> +grub_cpu_idle (void)
> +{
> + /* TODO */
> +}
> +
> +#endif /* ! KERNEL_CPU_TIME_HEADER */
> diff --git a/include/grub/riscv32/types.h
> b/include/grub/riscv32/types.h
> new file mode 100644
> index 000000000..fac57a752
> --- /dev/null
> +++ b/include/grub/riscv32/types.h
> @@ -0,0 +1,34 @@
> +/*
> + * GRUB -- GRand Unified Bootloader
> + * Copyright (C) 2018 Free Software Foundation, Inc.
> + *
> + * GRUB is free software: you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License as
> published by
> + * the Free Software Foundation, either version 3 of the License,
> or
> + * (at your option) any later version.
> + *
> + * GRUB is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> + * GNU General Public License for more details.
> + *
> + * You should have received a copy of the GNU General Public
> License
> + * along with GRUB. If not, see <http://www.gnu.org/licenses/>;.
> + */
> +
> +#ifndef GRUB_TYPES_CPU_HEADER
> +#define GRUB_TYPES_CPU_HEADER 1
> +
> +/* The size of void *. */
> +#define GRUB_TARGET_SIZEOF_VOID_P 4
> +
> +/* The size of long. */
> +#define GRUB_TARGET_SIZEOF_LONG 4
> +
> +/* currently only support little-endian. */
> +#undef GRUB_TARGET_WORDS_BIGENDIAN
> +
> +/* Unaligned accesses can be very slow, so avoid them */
> +#undef GRUB_HAVE_UNALIGNED_ACCESS
> +
> +#endif /* ! GRUB_TYPES_CPU_HEADER */
> diff --git a/include/grub/riscv64/efi/memory.h
> b/include/grub/riscv64/efi/memory.h
> new file mode 100644
> index 000000000..c6cb32417
> --- /dev/null
> +++ b/include/grub/riscv64/efi/memory.h
> @@ -0,0 +1,6 @@
> +#ifndef GRUB_MEMORY_CPU_HEADER
> +#include <grub/efi/memory.h>
> +
> +#define GRUB_EFI_MAX_USABLE_ADDRESS 0xffffffffffffULL
> +
> +#endif /* ! GRUB_MEMORY_CPU_HEADER */
> diff --git a/include/grub/riscv64/time.h
> b/include/grub/riscv64/time.h
> new file mode 100644
> index 000000000..20abd648b
> --- /dev/null
> +++ b/include/grub/riscv64/time.h
> @@ -0,0 +1,28 @@
> +/*
> + * GRUB -- GRand Unified Bootloader
> + * Copyright (C) 2018 Free Software Foundation, Inc.
> + *
> + * GRUB is free software: you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License as
> published by
> + * the Free Software Foundation, either version 3 of the License,
> or
> + * (at your option) any later version.
> + *
> + * GRUB is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> + * GNU General Public License for more details.
> + *
> + * You should have received a copy of the GNU General Public
> License
> + * along with GRUB. If not, see <http://www.gnu.org/licenses/>;.
> + */
> +
> +#ifndef KERNEL_CPU_TIME_HEADER
> +#define KERNEL_CPU_TIME_HEADER 1
> +
> +static __inline void
> +grub_cpu_idle (void)
> +{
> + /* TODO */
> +}
> +
> +#endif /* ! KERNEL_CPU_TIME_HEADER */
> diff --git a/include/grub/riscv64/types.h
> b/include/grub/riscv64/types.h
> new file mode 100644
> index 000000000..c6bcad470
> --- /dev/null
> +++ b/include/grub/riscv64/types.h
> @@ -0,0 +1,34 @@
> +/*
> + * GRUB -- GRand Unified Bootloader
> + * Copyright (C) 2018 Free Software Foundation, Inc.
> + *
> + * GRUB is free software: you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License as
> published by
> + * the Free Software Foundation, either version 3 of the License,
> or
> + * (at your option) any later version.
> + *
> + * GRUB is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> + * GNU General Public License for more details.
> + *
> + * You should have received a copy of the GNU General Public
> License
> + * along with GRUB. If not, see <http://www.gnu.org/licenses/>;.
> + */
> +
> +#ifndef GRUB_TYPES_CPU_HEADER
> +#define GRUB_TYPES_CPU_HEADER 1
> +
> +/* The size of void *. */
> +#define GRUB_TARGET_SIZEOF_VOID_P 8
> +
> +/* The size of long. */
> +#define GRUB_TARGET_SIZEOF_LONG 8
> +
> +/* currently only support little-endian. */
> +#undef GRUB_TARGET_WORDS_BIGENDIAN
> +
> +/* Unaligned accesses can be very slow, so avoid them */
> +#undef GRUB_HAVE_UNALIGNED_ACCESS
> +
> +#endif /* ! GRUB_TYPES_CPU_HEADER */
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