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https://github.com/AsahiLinux/u-boot
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ca7e93fa9f
Provide library functions to read: * machine vendor ID * machine architecture ID * machine implementation ID Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com> Reviewed-by: Sean Anderson <seanga2@gmail.com>
316 lines
6.9 KiB
C
316 lines
6.9 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* SBI initialilization and all extension implementation.
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*
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* Copyright (c) 2020 Western Digital Corporation or its affiliates.
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*
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* Taken from Linux arch/riscv/kernel/sbi.c
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*/
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#include <common.h>
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#include <asm/encoding.h>
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#include <asm/sbi.h>
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struct sbiret sbi_ecall(int ext, int fid, unsigned long arg0,
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unsigned long arg1, unsigned long arg2,
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unsigned long arg3, unsigned long arg4,
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unsigned long arg5)
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{
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struct sbiret ret;
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register uintptr_t a0 asm ("a0") = (uintptr_t)(arg0);
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register uintptr_t a1 asm ("a1") = (uintptr_t)(arg1);
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register uintptr_t a2 asm ("a2") = (uintptr_t)(arg2);
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register uintptr_t a3 asm ("a3") = (uintptr_t)(arg3);
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register uintptr_t a4 asm ("a4") = (uintptr_t)(arg4);
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register uintptr_t a5 asm ("a5") = (uintptr_t)(arg5);
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register uintptr_t a6 asm ("a6") = (uintptr_t)(fid);
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register uintptr_t a7 asm ("a7") = (uintptr_t)(ext);
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asm volatile ("ecall"
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: "+r" (a0), "+r" (a1)
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: "r" (a2), "r" (a3), "r" (a4), "r" (a5), "r" (a6), "r" (a7)
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: "memory");
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ret.error = a0;
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ret.value = a1;
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return ret;
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}
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/**
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* sbi_set_timer() - Program the timer for next timer event.
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* @stime_value: The value after which next timer event should fire.
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*
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* Return: None
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*/
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void sbi_set_timer(uint64_t stime_value)
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{
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#if __riscv_xlen == 32
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sbi_ecall(SBI_EXT_SET_TIMER, SBI_FID_SET_TIMER, stime_value,
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stime_value >> 32, 0, 0, 0, 0);
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#else
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sbi_ecall(SBI_EXT_SET_TIMER, SBI_FID_SET_TIMER, stime_value,
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0, 0, 0, 0, 0);
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#endif
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}
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/**
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* sbi_get_spec_version() - get current SBI specification version
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*
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* Return: version id
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*/
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long sbi_get_spec_version(void)
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{
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struct sbiret ret;
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ret = sbi_ecall(SBI_EXT_BASE, SBI_EXT_BASE_GET_SPEC_VERSION,
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0, 0, 0, 0, 0, 0);
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if (!ret.error)
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if (ret.value)
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return ret.value;
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return -ENOTSUPP;
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}
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/**
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* sbi_get_impl_id() - get SBI implementation ID
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*
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* Return: implementation ID
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*/
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int sbi_get_impl_id(void)
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{
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struct sbiret ret;
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ret = sbi_ecall(SBI_EXT_BASE, SBI_EXT_BASE_GET_IMP_ID,
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0, 0, 0, 0, 0, 0);
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if (!ret.error)
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if (ret.value)
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return ret.value;
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return -ENOTSUPP;
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}
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/**
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* sbi_get_impl_version() - get SBI implementation version
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*
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* @version: pointer to receive version
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* Return: 0 on success, -ENOTSUPP otherwise
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*/
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int sbi_get_impl_version(long *version)
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{
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struct sbiret ret;
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ret = sbi_ecall(SBI_EXT_BASE, SBI_EXT_BASE_GET_IMP_VERSION,
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0, 0, 0, 0, 0, 0);
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if (ret.error)
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return -ENOTSUPP;
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if (version)
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*version = ret.value;
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return 0;
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}
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/**
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* sbi_probe_extension() - Check if an SBI extension ID is supported or not.
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* @extid: The extension ID to be probed.
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*
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* Return: Extension specific nonzero value f yes, -ENOTSUPP otherwise.
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*/
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int sbi_probe_extension(int extid)
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{
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struct sbiret ret;
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ret = sbi_ecall(SBI_EXT_BASE, SBI_EXT_BASE_PROBE_EXT, extid,
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0, 0, 0, 0, 0);
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if (!ret.error)
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if (ret.value)
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return ret.value;
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return -ENOTSUPP;
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}
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/**
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* sbi_get_mvendorid() - get machine vendor ID
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*
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* @mimpid: on return machine vendor ID
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* Return: 0 on success
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*/
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int sbi_get_mvendorid(long *mvendorid)
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{
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struct sbiret ret;
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ret = sbi_ecall(SBI_EXT_BASE, SBI_EXT_BASE_GET_MVENDORID,
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0, 0, 0, 0, 0, 0);
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if (ret.error)
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return -ENOTSUPP;
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if (mvendorid)
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*mvendorid = ret.value;
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return 0;
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}
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/**
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* sbi_get_marchid() - get machine architecture ID
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*
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* @mimpid: on return machine architecture ID
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* Return: 0 on success
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*/
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int sbi_get_marchid(long *marchid)
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{
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struct sbiret ret;
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ret = sbi_ecall(SBI_EXT_BASE, SBI_EXT_BASE_GET_MARCHID,
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0, 0, 0, 0, 0, 0);
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if (ret.error)
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return -ENOTSUPP;
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if (marchid)
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*marchid = ret.value;
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return 0;
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}
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/**
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* sbi_get_mimpid() - get machine implementation ID
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*
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* @mimpid: on return machine implementation ID
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* Return: 0 on success
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*/
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int sbi_get_mimpid(long *mimpid)
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{
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struct sbiret ret;
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ret = sbi_ecall(SBI_EXT_BASE, SBI_EXT_BASE_GET_MIMPID,
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0, 0, 0, 0, 0, 0);
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if (ret.error)
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return -ENOTSUPP;
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if (mimpid)
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*mimpid = ret.value;
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return 0;
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}
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/**
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* sbi_srst_reset() - invoke system reset extension
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*
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* @type: type of reset
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* @reason: reason for reset
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*/
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void sbi_srst_reset(unsigned long type, unsigned long reason)
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{
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sbi_ecall(SBI_EXT_SRST, SBI_EXT_SRST_RESET, type, reason,
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0, 0, 0, 0);
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}
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#ifdef CONFIG_SBI_V01
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/**
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* sbi_console_putchar() - Writes given character to the console device.
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* @ch: The data to be written to the console.
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*
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* Return: None
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*/
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void sbi_console_putchar(int ch)
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{
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sbi_ecall(SBI_EXT_0_1_CONSOLE_PUTCHAR, 0, ch, 0, 0, 0, 0, 0);
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}
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/**
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* sbi_console_getchar() - Reads a byte from console device.
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*
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* Returns the value read from console.
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*/
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int sbi_console_getchar(void)
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{
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struct sbiret ret;
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ret = sbi_ecall(SBI_EXT_0_1_CONSOLE_GETCHAR, 0, 0, 0, 0, 0, 0, 0);
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return ret.error;
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}
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/**
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* sbi_clear_ipi() - Clear any pending IPIs for the calling hart.
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*
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* Return: None
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*/
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void sbi_clear_ipi(void)
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{
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sbi_ecall(SBI_EXT_0_1_CLEAR_IPI, 0, 0, 0, 0, 0, 0, 0);
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}
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/**
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* sbi_shutdown() - Remove all the harts from executing supervisor code.
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*
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* Return: None
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*/
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void sbi_shutdown(void)
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{
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sbi_ecall(SBI_EXT_0_1_SHUTDOWN, 0, 0, 0, 0, 0, 0, 0);
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}
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/**
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* sbi_send_ipi() - Send an IPI to any hart.
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* @hart_mask: A cpu mask containing all the target harts.
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*
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* Return: None
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*/
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void sbi_send_ipi(const unsigned long *hart_mask)
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{
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sbi_ecall(SBI_EXT_SEND_IPI, SBI_FID_SEND_IPI, (unsigned long)hart_mask,
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0, 0, 0, 0, 0);
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}
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/**
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* sbi_remote_fence_i() - Execute FENCE.I instruction on given remote harts.
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* @hart_mask: A cpu mask containing all the target harts.
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*
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* Return: None
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*/
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void sbi_remote_fence_i(const unsigned long *hart_mask)
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{
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sbi_ecall(SBI_EXT_REMOTE_FENCE_I, SBI_FID_REMOTE_FENCE_I,
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(unsigned long)hart_mask, 0, 0, 0, 0, 0);
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}
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/**
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* sbi_remote_sfence_vma() - Execute SFENCE.VMA instructions on given remote
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* harts for the specified virtual address range.
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* @hart_mask: A cpu mask containing all the target harts.
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* @start: Start of the virtual address
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* @size: Total size of the virtual address range.
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*
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* Return: None
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*/
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void sbi_remote_sfence_vma(const unsigned long *hart_mask,
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unsigned long start,
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unsigned long size)
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{
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sbi_ecall(SBI_EXT_REMOTE_SFENCE_VMA, SBI_FID_REMOTE_SFENCE_VMA,
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(unsigned long)hart_mask, start, size, 0, 0, 0);
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}
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/**
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* sbi_remote_sfence_vma_asid() - Execute SFENCE.VMA instructions on given
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* remote harts for a virtual address range belonging to a specific ASID.
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*
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* @hart_mask: A cpu mask containing all the target harts.
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* @start: Start of the virtual address
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* @size: Total size of the virtual address range.
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* @asid: The value of address space identifier (ASID).
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*
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* Return: None
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*/
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void sbi_remote_sfence_vma_asid(const unsigned long *hart_mask,
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unsigned long start,
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unsigned long size,
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unsigned long asid)
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{
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sbi_ecall(SBI_EXT_REMOTE_SFENCE_VMA_ASID,
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SBI_FID_REMOTE_SFENCE_VMA_ASID,
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(unsigned long)hart_mask, start, size, asid, 0, 0);
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}
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#endif /* CONFIG_SBI_V01 */
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