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https://github.com/riscv-software-src/opensbi.git
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2dfed32c46
We have extra space above scratch space (sbi_scratch) which we are currently using to manage per-HART IPI data and TLB request management. In future, more parts of OpenSBI will use the extra scratch space so it will become difficult to manage extra scratch space using just defines and macros. This patch adds a simple brain-dead allocator to manage extra scratch space. This allocator never expects anything to be free-ed hence it keeps incrementing to next allocation offset until it runs-out of space. In future, we can have more sophisticated allocator which will allow us to re-claim free-ed space and also allows us to track owner of allocated space. Signed-off-by: Anup Patel <anup.patel@wdc.com> Reviewed-by: Atish Patra <atish.patra@wdc.com>
107 lines
3.6 KiB
C
107 lines
3.6 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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#ifndef __SBI_SCRATCH_H__
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#define __SBI_SCRATCH_H__
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#include <sbi/riscv_asm.h>
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/* clang-format off */
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/** Offset of fw_start member in sbi_scratch */
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#define SBI_SCRATCH_FW_START_OFFSET (0 * __SIZEOF_POINTER__)
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/** Offset of fw_size member in sbi_scratch */
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#define SBI_SCRATCH_FW_SIZE_OFFSET (1 * __SIZEOF_POINTER__)
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/** Offset of next_arg1 member in sbi_scratch */
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#define SBI_SCRATCH_NEXT_ARG1_OFFSET (2 * __SIZEOF_POINTER__)
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/** Offset of next_addr member in sbi_scratch */
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#define SBI_SCRATCH_NEXT_ADDR_OFFSET (3 * __SIZEOF_POINTER__)
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/** Offset of next_mode member in sbi_scratch */
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#define SBI_SCRATCH_NEXT_MODE_OFFSET (4 * __SIZEOF_POINTER__)
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/** Offset of warmboot_addr member in sbi_scratch */
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#define SBI_SCRATCH_WARMBOOT_ADDR_OFFSET (5 * __SIZEOF_POINTER__)
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/** Offset of platform_addr member in sbi_scratch */
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#define SBI_SCRATCH_PLATFORM_ADDR_OFFSET (6 * __SIZEOF_POINTER__)
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/** Offset of hartid_to_scratch member in sbi_scratch */
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#define SBI_SCRATCH_HARTID_TO_SCRATCH_OFFSET (7 * __SIZEOF_POINTER__)
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/** Offset of tmp0 member in sbi_scratch */
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#define SBI_SCRATCH_TMP0_OFFSET (8 * __SIZEOF_POINTER__)
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/** Offset of options member in sbi_scratch */
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#define SBI_SCRATCH_OPTIONS_OFFSET (9 * __SIZEOF_POINTER__)
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/** Offset of extra space in sbi_scratch */
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#define SBI_SCRATCH_EXTRA_SPACE_OFFSET (10 * __SIZEOF_POINTER__)
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/** Maximum size of sbi_scratch and sbi_ipi_data */
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#define SBI_SCRATCH_SIZE (64 * __SIZEOF_POINTER__)
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/* clang-format on */
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#ifndef __ASSEMBLY__
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#include <sbi/sbi_types.h>
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#include <sbi/sbi_ipi.h>
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/** Representation of per-HART scratch space */
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struct sbi_scratch {
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/** Start (or base) address of firmware linked to OpenSBI library */
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unsigned long fw_start;
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/** Size (in bytes) of firmware linked to OpenSBI library */
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unsigned long fw_size;
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/** Arg1 (or 'a1' register) of next booting stage for this HART */
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unsigned long next_arg1;
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/** Address of next booting stage for this HART */
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unsigned long next_addr;
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/** Priviledge mode of next booting stage for this HART */
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unsigned long next_mode;
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/** Warm boot entry point address for this HART */
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unsigned long warmboot_addr;
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/** Address of sbi_platform */
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unsigned long platform_addr;
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/** Address of HART ID to sbi_scratch conversion function */
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unsigned long hartid_to_scratch;
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/** Temporary storage */
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unsigned long tmp0;
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/** Options for OpenSBI library */
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unsigned long options;
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} __packed;
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/** Possible options for OpenSBI library */
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enum sbi_scratch_options {
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/** Disable prints during boot */
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SBI_SCRATCH_NO_BOOT_PRINTS = (1 << 0),
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};
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/** Get pointer to sbi_scratch for current HART */
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#define sbi_scratch_thishart_ptr() \
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((struct sbi_scratch *)csr_read(CSR_MSCRATCH))
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/** Get Arg1 of next booting stage for current HART */
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#define sbi_scratch_thishart_arg1_ptr() \
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((void *)(sbi_scratch_thishart_ptr()->next_arg1))
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/** Allocate from extra space in sbi_scratch
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*
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* @return zero on failure and non-zero (>= SBI_SCRATCH_EXTRA_SPACE_OFFSET)
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* on success
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*/
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unsigned long sbi_scratch_alloc_offset(unsigned long size, const char *owner);
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/** Free-up extra space in sbi_scratch */
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void sbi_scratch_free_offset(unsigned long offset);
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/** Get pointer from offset in sbi_scratch */
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#define sbi_scratch_offset_ptr(scratch, offset) ((void *)scratch + (offset))
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/** Get pointer from offset in sbi_scratch for current HART */
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#define sbi_scratch_thishart_offset_ptr(offset) \
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((void *)sbi_scratch_thishart_ptr() + (offset))
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#endif
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#endif
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