mcall.h

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/* SPDX-License-Identifier: GPL-2.0-only */
 
#ifndef _MCALL_H
#define _MCALL_H
 
// NOTE: this is the size of hls_t below. A static_assert would be
// nice to have.
#if __riscv_xlen == 64
#define HLS_SIZE 88
#endif
 
#if __riscv_xlen == 32
#define HLS_SIZE 52
#endif
 
/* We save 37 registers, currently. */
#define MENTRY_FRAME_SIZE (HLS_SIZE + 37 * __SIZEOF_POINTER__)
 
#ifndef __ASSEMBLER__
 
#include <arch/encoding.h>
#include <arch/smp/atomic.h>
#include <stdint.h>
 
typedef struct {
        unsigned long dev;
        unsigned long cmd;
        unsigned long data;
        unsigned long sbi_private_data;
} sbi_device_message;
 
struct blocker {
        void *arg;
        void (*fn)(void *arg);
        atomic_t sync_a;
        atomic_t sync_b;
};
 
typedef struct {
        sbi_device_message *device_request_queue_head;
        unsigned long device_request_queue_size;
        sbi_device_message *device_response_queue_head;
        sbi_device_message *device_response_queue_tail;
 
        int hart_id;
        int ipi_pending;
        uint64_t *timecmp;
        uint64_t *time;
        void *fdt;
        struct blocker entry;
} hls_t;
 
_Static_assert(
        sizeof(hls_t) == HLS_SIZE,
        "HLS_SIZE must equal to sizeof(hls_t)");
 
#define MACHINE_STACK_TOP() ({ \
        /* coverity[uninit_use] : FALSE */ \
        register uintptr_t sp asm ("sp"); \
        (void*)((sp + RISCV_PGSIZE) & -RISCV_PGSIZE); })
 
// hart-local storage, at top of stack
#define HLS() ((hls_t*)(MACHINE_STACK_TOP() - HLS_SIZE))
#define OTHER_HLS(id) ((hls_t*)((void*)HLS() + RISCV_PGSIZE * ((id) - HLS()->hart_id)))
 
#define MACHINE_STACK_SIZE RISCV_PGSIZE
 
// need to call this before launching linux
void hls_init(uint32_t hart_id, void *fdt);
 
/* This function is used to initialize HLS()->time/HLS()->timecmp  */
void mtime_init(void);
 
/*
 * This function needs be implement by SoC code.
 * Although the privileged instruction set defines that MSIP will be
 * memory-mapped, but does not define how to map. SoC can be implemented as
 * a bit, a byte, a word, and so on.
 * So we can't provide code that is related to implementation.
 */
void set_msip(int hartid, int val);
 
#endif // __ASSEMBLER__
 
#endif