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RISC-V: Add auxiliary files

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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 <agraf@suse.de>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
This commit is contained in:
Alexander Graf 2019-02-12 11:31:05 +01:00 committed by Daniel Kiper
parent e0d32cca1d
commit 861212333e
9 changed files with 319 additions and 0 deletions
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63
grub-core/kern/riscv/cache.c Normal file
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/*
* 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 */
}

44
grub-core/kern/riscv/cache_flush.S Normal file
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/*
* 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

76
grub-core/kern/riscv/efi/init.c Normal file
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/* 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 ();
}

6
include/grub/riscv32/efi/memory.h Normal file
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#ifndef GRUB_MEMORY_CPU_HEADER
#include <grub/efi/memory.h>
#define GRUB_EFI_MAX_USABLE_ADDRESS 0xffffffffUL
#endif /* ! GRUB_MEMORY_CPU_HEADER */

28
include/grub/riscv32/time.h Normal file
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/*
* 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 */

34
include/grub/riscv32/types.h Normal file
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/*
* 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 */

6
include/grub/riscv64/efi/memory.h Normal file
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#ifndef GRUB_MEMORY_CPU_HEADER
#include <grub/efi/memory.h>
#define GRUB_EFI_MAX_USABLE_ADDRESS 0xffffffffffffULL
#endif /* ! GRUB_MEMORY_CPU_HEADER */

28
include/grub/riscv64/time.h Normal file
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/*
* 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 */

34
include/grub/riscv64/types.h Normal file
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/*
* 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 */