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Diffstat (limited to 'arch/riscv/include/asm/page.h')
| -rw-r--r-- | arch/riscv/include/asm/page.h | 62 |
1 files changed, 0 insertions, 62 deletions
diff --git a/arch/riscv/include/asm/page.h b/arch/riscv/include/asm/page.h deleted file mode 100644 index 7b9f155..0000000 --- a/arch/riscv/include/asm/page.h +++ /dev/null @@ -1,62 +0,0 @@ -/* SPDX-License-Identifier: GPL-2.0-or-later */ -/* Copyright (C) 2026 Richard Qin */ - -#ifndef _ASM_RISCV_PAGE_H -#define _ASM_RISCV_PAGE_H - -/* - * RISC-V page / virtual-memory layout constants. - * - * Mirrors the subset of Linux arch/riscv/include/asm/page.h that LumeOS's - * early boot path needs: - * - PAGE_SIZE / PAGE_SHIFT / PAGE_MASK - * - PAGE_OFFSET (start of the higher-half direct map) - * - KERNEL_LINK_ADDR (link-time VA of _start) - * - SV39 PTE flag bits - * - PTRS_PER_PGD (512 for SV39) - * - * Values match Linux RISC-V SV39 defaults so that struct kernel_mapping - * (filled by setup_vm in arch/riscv/mm/init.cc) carries the same numeric - * relations Linux's mm/init.c maintains. - */ - -#define PAGE_SHIFT 12 -#define PAGE_SIZE (1UL << PAGE_SHIFT) -#define PAGE_MASK (~(PAGE_SIZE - 1)) - -/* Higher-half base of the kernel direct map. Bottom of the SV39 supervisor - * address space minus the unmapped guard region. Identical to Linux's - * CONFIG_PAGE_OFFSET default on RV64. */ -#define PAGE_OFFSET 0xFFFFFFC000000000UL - -/* Where _start was linked. OpenSBI hands control to PHYS_BASE; the kernel - * runs at KERNEL_LINK_ADDR after relocate_enable_mmu jumps to higher-half. */ -#define PHYS_BASE 0x80200000UL -#define KERNEL_LINK_ADDR 0xFFFFFFC080200000UL - -/* SATP mode field — SV39 = 8, shifted to bits [63:60]. */ -#define SATP_MODE_SV39 (8UL << 60) - -#define PTRS_PER_PGD 512 - -/* 1 GB superpage size — entry.S used to build the early page table with - * these; setup_vm in arch/riscv/mm/init.cc now does the same. */ -#define PGDIR_SHIFT 30 -#define PGDIR_SIZE (1UL << PGDIR_SHIFT) -#define PGDIR_MASK (~(PGDIR_SIZE - 1)) - -/* SV39 PTE flag bits (one byte). */ -#define _PAGE_PRESENT (1UL << 0) /* aka VALID — historic Linux name */ -#define _PAGE_READ (1UL << 1) -#define _PAGE_WRITE (1UL << 2) -#define _PAGE_EXEC (1UL << 3) -#define _PAGE_USER (1UL << 4) -#define _PAGE_GLOBAL (1UL << 5) -#define _PAGE_ACCESSED (1UL << 6) -#define _PAGE_DIRTY (1UL << 7) - -#define PAGE_KERNEL_EXEC \ - (_PAGE_PRESENT | _PAGE_READ | _PAGE_WRITE | _PAGE_EXEC | \ - _PAGE_ACCESSED | _PAGE_DIRTY) - -#endif /* _ASM_RISCV_PAGE_H */ |