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https://github.com/riscv-software-src/opensbi.git
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f700216cb5
Currently, there is no provision for tracking multiple IPIs sent to a single hart at the same time by different harts. Use a fifo manage the outstanding requests. While dequeueing, read all the entries once, because we have only 1 bit to track the type of IPI. Once the queue is full, busy wait until the there is space available in queue. This is not the most elegant approach. It should be changed in favor of a wakeup event once available in opensbi. Signed-off-by: Atish Patra <atish.patra@wdc.com>
104 lines
3.7 KiB
C
104 lines
3.7 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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#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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/** 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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/** sbi_ipi_data is located behind sbi_scratch. This struct is not packed. */
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/** Offset of ipi_type in sbi_ipi_data */
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#define SBI_IPI_DATA_IPI_TYPE_OFFSET (15 * __SIZEOF_POINTER__)
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#define SBI_SCRATCH_TLB_QUEUE_HEAD_OFFSET (16 * __SIZEOF_POINTER__)
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#define SBI_SCRATCH_TLB_QUEUE_MEM_OFFSET (SBI_SCRATCH_TLB_QUEUE_HEAD_OFFSET + SBI_TLB_INFO_SIZE)
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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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#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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/** Get pointer to sbi_ipi_data from sbi_scratch */
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#define sbi_ipi_data_ptr(scratch) \
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((struct sbi_ipi_data *)(void*)scratch + SBI_IPI_DATA_IPI_TYPE_OFFSET)
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/** Get pointer to tlb flush info fifo header from sbi_scratch */
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#define sbi_tlb_fifo_head_ptr(scratch) \
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((struct sbi_fifo *)(void*)scratch + SBI_SCRATCH_TLB_QUEUE_HEAD_OFFSET)
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/** Get pointer to tlb flush info fifo queue address from sbi_scratch */
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#define sbi_tlb_fifo_mem_ptr(scratch) \
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(void *)((void*)scratch + SBI_SCRATCH_TLB_QUEUE_MEM_OFFSET)
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#endif
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#endif
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