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