mirror of
https://github.com/riscv-software-src/opensbi
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179eddeb9c
Instead of using loop to make "size" machine word aligned, we should use bitwise ops. Signed-off-by: Li Jinpei <leekingp1994@163.com> Signed-off-by: Anup Patel <anup.patel@wdc.com> Reviewed-by: Atish Patra <atish.patra@wdc.com>
77 lines
1.7 KiB
C
77 lines
1.7 KiB
C
/*
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* SPDX-License-Identifier: BSD-2-Clause
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*
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* Copyright (c) 2019 Western Digital Corporation or its affiliates.
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*
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* Authors:
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* Anup Patel <anup.patel@wdc.com>
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*/
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#include <sbi/riscv_locks.h>
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#include <sbi/sbi_hart.h>
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#include <sbi/sbi_platform.h>
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#include <sbi/sbi_scratch.h>
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#include <sbi/sbi_string.h>
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static spinlock_t extra_lock = SPIN_LOCK_INITIALIZER;
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static unsigned long extra_offset = SBI_SCRATCH_EXTRA_SPACE_OFFSET;
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unsigned long sbi_scratch_alloc_offset(unsigned long size, const char *owner)
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{
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u32 i;
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void *ptr;
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unsigned long ret = 0;
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struct sbi_scratch *scratch, *rscratch;
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const struct sbi_platform *plat;
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/*
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* We have a simple brain-dead allocator which never expects
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* anything to be free-ed hence it keeps incrementing the
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* next allocation offset until it runs-out of space.
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*
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* In future, we will have more sophisticated allocator which
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* will allow us to re-claim free-ed space.
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*/
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if (!size)
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return 0;
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if (size & (__SIZEOF_POINTER__ - 1))
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size = (size & ~(__SIZEOF_POINTER__ - 1)) + __SIZEOF_POINTER__;
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spin_lock(&extra_lock);
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if (SBI_SCRATCH_SIZE < (extra_offset + size))
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goto done;
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ret = extra_offset;
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extra_offset += size;
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done:
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spin_unlock(&extra_lock);
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if (ret) {
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scratch = sbi_scratch_thishart_ptr();
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plat = sbi_platform_ptr(scratch);
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for (i = 0; i < sbi_platform_hart_count(plat); i++) {
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rscratch = sbi_hart_id_to_scratch(scratch, i);
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ptr = sbi_scratch_offset_ptr(rscratch, ret);
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sbi_memset(ptr, 0, size);
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}
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}
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return ret;
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}
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void sbi_scratch_free_offset(unsigned long offset)
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{
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if ((offset < SBI_SCRATCH_EXTRA_SPACE_OFFSET) ||
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(SBI_SCRATCH_SIZE <= offset))
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return;
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/*
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* We don't actually free-up because it's a simple
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* brain-dead allocator.
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*/
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}
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