src/arch/riscv/include/mcall.h

   1 /*
   2  * This file is part of the coreboot project.
   3  *
   4  * Copyright (C) 2013 The ChromiumOS Authors
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; version 2 of the License.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  */
  15
  16 #ifndef _MCALL_H
  17 #define _MCALL_H
  18
  19 // NOTE: this is the size of hls_t below. A static_assert would be
  20 // nice to have.
  21 #define HLS_SIZE 88
  22
  23 /* We save 37 registers, currently. */
  24 #define MENTRY_FRAME_SIZE (HLS_SIZE + 37 * 8)
  25
  26 #ifndef __ASSEMBLER__
  27
  28 #include <arch/encoding.h>
  29 #include <stdint.h>
  30
  31 typedef struct {
  32         unsigned long dev;
  33         unsigned long cmd;
  34         unsigned long data;
  35         unsigned long sbi_private_data;
  36 } sbi_device_message;
  37
  38 struct blocker {
  39         void *arg;
  40         void (*fn)(void *arg);
  41         uint32_t sync_a;
  42         uint32_t sync_b;
  43 };
  44
  45 typedef struct {
  46         sbi_device_message *device_request_queue_head;
  47         unsigned long device_request_queue_size;
  48         sbi_device_message *device_response_queue_head;
  49         sbi_device_message *device_response_queue_tail;
  50
  51         int hart_id;
  52         int ipi_pending;
  53         uint64_t *timecmp;
  54         uint64_t *time;
  55         struct blocker entry;
  56 } hls_t;
  57
  58 #define MACHINE_STACK_TOP() ({ \
  59         /* coverity[uninit_use] : FALSE */ \
  60         register uintptr_t sp asm ("sp"); \
  61         (void*)((sp + RISCV_PGSIZE) & -RISCV_PGSIZE); })
  62
  63 // hart-local storage, at top of stack
  64 #define HLS() ((hls_t*)(MACHINE_STACK_TOP() - HLS_SIZE))
  65 #define OTHER_HLS(id) ((hls_t*)((void*)HLS() + RISCV_PGSIZE * ((id) - HLS()->hart_id)))
  66
  67 #define MACHINE_STACK_SIZE RISCV_PGSIZE
  68
  69 void hls_init(uint32_t hart_id); // need to call this before launching linux
  70
  71 /* This function is used to initialize HLS()->time/HLS()->timecmp  */
  72 void mtime_init(void);
  73
  74 /*
  75  * This function needs be implement by SoC code.
  76  * Although the privileged instruction set defines that MSIP will be
  77  * memory-mapped, but does not define how to map. SoC can be implemented as
  78  * a bit, a byte, a word, and so on.
  79  * So we can't provide code that is related to implementation.
  80  */
  81 void set_msip(int hartid, int val);
  82
  83 #endif // __ASSEMBLER__
  84
  85 #endif