1 // SPDX-License-Identifier: GPL-2.0-only
3 * SBI initialilization and all extension implementation.
5 * Copyright (c) 2020 Western Digital Corporation or its affiliates.
7 * Taken from Linux arch/riscv/kernel/sbi.c
11 #include <asm/encoding.h>
14 /* default SBI version is 0.1 */
15 unsigned long sbi_spec_version = SBI_SPEC_VERSION_DEFAULT;
17 struct sbiret sbi_ecall(int ext, int fid, unsigned long arg0,
18 unsigned long arg1, unsigned long arg2,
19 unsigned long arg3, unsigned long arg4,
24 register uintptr_t a0 asm ("a0") = (uintptr_t)(arg0);
25 register uintptr_t a1 asm ("a1") = (uintptr_t)(arg1);
26 register uintptr_t a2 asm ("a2") = (uintptr_t)(arg2);
27 register uintptr_t a3 asm ("a3") = (uintptr_t)(arg3);
28 register uintptr_t a4 asm ("a4") = (uintptr_t)(arg4);
29 register uintptr_t a5 asm ("a5") = (uintptr_t)(arg5);
30 register uintptr_t a6 asm ("a6") = (uintptr_t)(fid);
31 register uintptr_t a7 asm ("a7") = (uintptr_t)(ext);
33 : "+r" (a0), "+r" (a1)
34 : "r" (a2), "r" (a3), "r" (a4), "r" (a5), "r" (a6), "r" (a7)
45 * sbi_console_putchar() - Writes given character to the console device.
46 * @ch: The data to be written to the console.
50 void sbi_console_putchar(int ch)
52 sbi_ecall(SBI_EXT_0_1_CONSOLE_PUTCHAR, 0, ch, 0, 0, 0, 0, 0);
56 * sbi_console_getchar() - Reads a byte from console device.
58 * Returns the value read from console.
60 int sbi_console_getchar(void)
64 ret = sbi_ecall(SBI_EXT_0_1_CONSOLE_GETCHAR, 0, 0, 0, 0, 0, 0, 0);
70 * sbi_clear_ipi() - Clear any pending IPIs for the calling hart.
74 void sbi_clear_ipi(void)
76 sbi_ecall(SBI_EXT_0_1_CLEAR_IPI, 0, 0, 0, 0, 0, 0, 0);
80 * sbi_shutdown() - Remove all the harts from executing supervisor code.
84 void sbi_shutdown(void)
86 sbi_ecall(SBI_EXT_0_1_SHUTDOWN, 0, 0, 0, 0, 0, 0, 0);
89 #endif /* CONFIG_SBI_V01 */
92 * sbi_set_timer() - Program the timer for next timer event.
93 * @stime_value: The value after which next timer event should fire.
97 void sbi_set_timer(uint64_t stime_value)
99 #if __riscv_xlen == 32
100 sbi_ecall(SBI_EXT_SET_TIMER, SBI_FID_SET_TIMER, stime_value,
101 stime_value >> 32, 0, 0, 0, 0);
103 sbi_ecall(SBI_EXT_SET_TIMER, SBI_FID_SET_TIMER, stime_value,
109 * sbi_send_ipi() - Send an IPI to any hart.
110 * @hart_mask: A cpu mask containing all the target harts.
114 void sbi_send_ipi(const unsigned long *hart_mask)
116 sbi_ecall(SBI_EXT_SEND_IPI, SBI_FID_SEND_IPI, (unsigned long)hart_mask,
121 * sbi_remote_fence_i() - Execute FENCE.I instruction on given remote harts.
122 * @hart_mask: A cpu mask containing all the target harts.
126 void sbi_remote_fence_i(const unsigned long *hart_mask)
128 sbi_ecall(SBI_EXT_REMOTE_FENCE_I, SBI_FID_REMOTE_FENCE_I,
129 (unsigned long)hart_mask, 0, 0, 0, 0, 0);
133 * sbi_remote_sfence_vma() - Execute SFENCE.VMA instructions on given remote
134 * harts for the specified virtual address range.
135 * @hart_mask: A cpu mask containing all the target harts.
136 * @start: Start of the virtual address
137 * @size: Total size of the virtual address range.
141 void sbi_remote_sfence_vma(const unsigned long *hart_mask,
145 sbi_ecall(SBI_EXT_REMOTE_SFENCE_VMA, SBI_FID_REMOTE_SFENCE_VMA,
146 (unsigned long)hart_mask, start, size, 0, 0, 0);
150 * sbi_remote_sfence_vma_asid() - Execute SFENCE.VMA instructions on given
151 * remote harts for a virtual address range belonging to a specific ASID.
153 * @hart_mask: A cpu mask containing all the target harts.
154 * @start: Start of the virtual address
155 * @size: Total size of the virtual address range.
156 * @asid: The value of address space identifier (ASID).
160 void sbi_remote_sfence_vma_asid(const unsigned long *hart_mask,
165 sbi_ecall(SBI_EXT_REMOTE_SFENCE_VMA_ASID,
166 SBI_FID_REMOTE_SFENCE_VMA_ASID,
167 (unsigned long)hart_mask, start, size, asid, 0, 0);
171 * sbi_probe_extension() - Check if an SBI extension ID is supported or not.
172 * @extid: The extension ID to be probed.
174 * Return: Extension specific nonzero value f yes, -ENOTSUPP otherwise.
176 int sbi_probe_extension(int extid)
180 ret = sbi_ecall(SBI_EXT_BASE, SBI_EXT_BASE_PROBE_EXT, extid,