From b30ee14270a44e48167934b9b3923b4280bdc855 Mon Sep 17 00:00:00 2001 From: Kimplul Date: Fri, 1 Oct 2021 20:36:15 +0300 Subject: First jump to virtual memory! + Lots of bughunting to do, probably lots of off-by-one and so on errors, and I make a lot of naive and possibly dangerous assumptions. But cool start nonetheless. Should also come up with some method of exchanging data between the init and actual kernel, probably some struct of some sort. TODO --- arch/riscv/include/csr.h | 18 ++++++++++++++++-- 1 file changed, 16 insertions(+), 2 deletions(-) (limited to 'arch/riscv/include/csr.h') diff --git a/arch/riscv/include/csr.h b/arch/riscv/include/csr.h index 694000b..5da0882 100644 --- a/arch/riscv/include/csr.h +++ b/arch/riscv/include/csr.h @@ -1,8 +1,22 @@ #ifndef APOS_CSR_H #define APOS_CSR_H -#define csr_write(csr, val) - #define SATP_MODE_39 0x8000000000000000 +#define SATP_MODE_48 0x9000000000000000 + +#define CSR_SATP 0x180 + +/* directly lifted from Linux:/arch/riscv/include/asm/asm.h:9-13 */ +#ifdef __ASSEMBLY__ +#define __ASM_STR(x) x +#else +#define __ASM_STR(x) #x +#endif + +#define csr_read(csr, res)\ + __asm__ ("csrr %0, " __ASM_STR(csr) : "=r" (res) : : "memory") + +#define csr_write(csr, val)\ + __asm__ ("csrw " __ASM_STR(csr) ", %0" : : "rK" (val) : "memory") #endif /* APOS_CSR_H */ -- cgit v1.3