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/*
* SPDX-License-Identifier: BSD-2-Clause
*
* Copyright (c) 2019 Western Digital Corporation or its affiliates.
*
* Authors:
* Anup Patel <anup.patel@wdc.com>
*/
#ifndef __SBI_SCRATCH_H__
#define __SBI_SCRATCH_H__
#include <sbi/riscv_asm.h>
/* clang-format off */
/** Offset of fw_start member in sbi_scratch */
#define SBI_SCRATCH_FW_START_OFFSET (0 * __SIZEOF_POINTER__)
/** Offset of fw_size member in sbi_scratch */
#define SBI_SCRATCH_FW_SIZE_OFFSET (1 * __SIZEOF_POINTER__)
/** Offset of next_arg1 member in sbi_scratch */
#define SBI_SCRATCH_NEXT_ARG1_OFFSET (2 * __SIZEOF_POINTER__)
/** Offset of next_addr member in sbi_scratch */
#define SBI_SCRATCH_NEXT_ADDR_OFFSET (3 * __SIZEOF_POINTER__)
/** Offset of next_mode member in sbi_scratch */
#define SBI_SCRATCH_NEXT_MODE_OFFSET (4 * __SIZEOF_POINTER__)
/** Offset of warmboot_addr member in sbi_scratch */
#define SBI_SCRATCH_WARMBOOT_ADDR_OFFSET (5 * __SIZEOF_POINTER__)
/** Offset of platform_addr member in sbi_scratch */
#define SBI_SCRATCH_PLATFORM_ADDR_OFFSET (6 * __SIZEOF_POINTER__)
/** Offset of hartid_to_scratch member in sbi_scratch */
#define SBI_SCRATCH_HARTID_TO_SCRATCH_OFFSET (7 * __SIZEOF_POINTER__)
/** Offset of trap_exit member in sbi_scratch */
#define SBI_SCRATCH_TRAP_EXIT_OFFSET (8 * __SIZEOF_POINTER__)
/** Offset of tmp0 member in sbi_scratch */
#define SBI_SCRATCH_TMP0_OFFSET (9 * __SIZEOF_POINTER__)
/** Offset of options member in sbi_scratch */
#define SBI_SCRATCH_OPTIONS_OFFSET (10 * __SIZEOF_POINTER__)
/** Offset of extra space in sbi_scratch */
#define SBI_SCRATCH_EXTRA_SPACE_OFFSET (11 * __SIZEOF_POINTER__)
/** Maximum size of sbi_scratch (4KB) */
#define SBI_SCRATCH_SIZE (0x1000)
/* clang-format on */
#ifndef __ASSEMBLER__
#include <sbi/sbi_types.h>
/** Representation of per-HART scratch space */
struct sbi_scratch {
/** Start (or base) address of firmware linked to OpenSBI library */
unsigned long fw_start;
/** Size (in bytes) of firmware linked to OpenSBI library */
unsigned long fw_size;
/** Arg1 (or 'a1' register) of next booting stage for this HART */
unsigned long next_arg1;
/** Address of next booting stage for this HART */
unsigned long next_addr;
/** Priviledge mode of next booting stage for this HART */
unsigned long next_mode;
/** Warm boot entry point address for this HART */
unsigned long warmboot_addr;
/** Address of sbi_platform */
unsigned long platform_addr;
/** Address of HART ID to sbi_scratch conversion function */
unsigned long hartid_to_scratch;
/** Address of trap exit function */
unsigned long trap_exit;
/** Temporary storage */
unsigned long tmp0;
/** Options for OpenSBI library */
unsigned long options;
};
/** Possible options for OpenSBI library */
enum sbi_scratch_options {
/** Disable prints during boot */
SBI_SCRATCH_NO_BOOT_PRINTS = (1 << 0),
/** Enable runtime debug prints */
SBI_SCRATCH_DEBUG_PRINTS = (1 << 1),
};
/** Get pointer to sbi_scratch for current HART */
#define sbi_scratch_thishart_ptr() \
((struct sbi_scratch *)csr_read(CSR_MSCRATCH))
/** Get Arg1 of next booting stage for current HART */
#define sbi_scratch_thishart_arg1_ptr() \
((void *)(sbi_scratch_thishart_ptr()->next_arg1))
/** Initialize scratch table and allocator */
int sbi_scratch_init(struct sbi_scratch *scratch);
/**
* Allocate from extra space in sbi_scratch
*
* @return zero on failure and non-zero (>= SBI_SCRATCH_EXTRA_SPACE_OFFSET)
* on success
*/
unsigned long sbi_scratch_alloc_offset(unsigned long size);
/** Free-up extra space in sbi_scratch */
void sbi_scratch_free_offset(unsigned long offset);
/** Get pointer from offset in sbi_scratch */
#define sbi_scratch_offset_ptr(scratch, offset) (void *)((char *)(scratch) + (offset))
/** Get pointer from offset in sbi_scratch for current HART */
#define sbi_scratch_thishart_offset_ptr(offset) \
(void *)((char *)sbi_scratch_thishart_ptr() + (offset))
/** HART id to scratch table */
extern struct sbi_scratch *hartid_to_scratch_table[];
/** Get sbi_scratch from HART id */
#define sbi_hartid_to_scratch(__hartid) \
hartid_to_scratch_table[__hartid]
/** Last HART id having a sbi_scratch pointer */
extern u32 last_hartid_having_scratch;
/** Get last HART id having a sbi_scratch pointer */
#define sbi_scratch_last_hartid() last_hartid_having_scratch
#endif
#endif
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