/* * RISC-V supervisor binary interface (SBI) trampoline page * * Copyright 2016 Jonathan Neuschäfer <j.neuschaefer@gmx.net> * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License as * published by the Free Software Foundation; version 2 of * the License. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.See the * GNU General Public License for more details. */ #define __ASSEMBLY__ #include <arch/encoding.h> #include <mcall.h> .section ".text.sbi", "ax", %progbits /* align to a page boundary */ .align RISCV_PGSHIFT .globl sbi_page sbi_page: /* * None of the SBI entry points is located in the first half of the * page */ .skip 0x800 /* -2048: size_t sbi_hart_id(void); */ li a7, MCALL_HART_ID ecall jr ra .align 4 /* -2032: size_t sbi_num_harts(void); */ li a7, MCALL_NUM_HARTS ecall jr ra .align 4 /* -2016: unsigned long sbi_query_memory(unsigned long id, memory_block_info *p); */ li a7, MCALL_QUERY_MEMORY ecall jr ra .align 4 /* -2000: int sbi_console_putchar(uint8_t ch); */ li a7, MCALL_CONSOLE_PUTCHAR ecall jr ra .align 4 /* -1984: int sbi_console_getchar(void); */ li a0, -1 /* failure: Coreboot doesn't support console input */ jr ra .align 4 /* -1968: Not allocated */ ebreak .align 4 /* -1952: int sbi_send_ipi(size_t hart_id); */ ebreak .align 4 /* -1936: int bool sbi_clear_ipi(void); */ ebreak .align 4 /* -1920: unsigned long sbi_timebase(void); */ li a0, 1000000000 /* I have no idea. */ jr ra .align 4 /* -1904: void sbi_shutdown(void); */ li a7, MCALL_SHUTDOWN ecall jr ra .align 4 /* -1888: void sbi_set_timer(unsigned long long stime_value); */ li a7, MCALL_SET_TIMER ecall jr ra .align 4 /* -1872: int sbi_mask_interrupt(int which); */ li a0, 0 # dummy jr ra .align 4 /* -1856: int sbi_unmask_interrupt(int which); */ li a0, 0 # dummy jr ra .align 4 /* -1840: void sbi_remote_sfence_vm(const uintptr_t* harts, size_t asid); */ ebreak .align 4 /* -1824: void sbi_remote_sfence_vm_range(const uintptr_t* harts, size_t asid, uintptr_t start, uintptr_t size); */ ebreak .align 4 /* -1808: void sbi_remote_fence_i(const uintptr_t* harts); */ ebreak .align 4 /* Fill the remainder of the page */ .align RISCV_PGSHIFT