mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-26 00:05:35 +07:00
6bd33e1ece
The kernel runs in M-mode without using page tables, and thus can't run bare metal without help from additional firmware. Most of the patch is just stubbing out code not needed without page tables, but there is an interesting detail in the signals implementation: - The normal RISC-V syscall ABI only implements rt_sigreturn as VDSO entry point, but the ELF VDSO is not supported for nommu Linux. We instead copy the code to call the syscall onto the stack. In addition to enabling the nommu code a new defconfig for a small kernel image that can run in nommu mode on qemu is also provided, to run a kernel in qemu you can use the following command line: qemu-system-riscv64 -smp 2 -m 64 -machine virt -nographic \ -kernel arch/riscv/boot/loader \ -drive file=rootfs.ext2,format=raw,id=hd0 \ -device virtio-blk-device,drive=hd0 Contains contributions from Damien Le Moal <Damien.LeMoal@wdc.com>. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Anup Patel <anup@brainfault.org> [paul.walmsley@sifive.com: updated to apply; add CONFIG_MMU guards around PCI_IOBASE definition to fix build issues; fixed checkpatch issues; move the PCI_IO_* and VMEMMAP address space macros along with the others; resolve sparse warning] Signed-off-by: Paul Walmsley <paul.walmsley@sifive.com>
135 lines
3.6 KiB
C
135 lines
3.6 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Copyright (C) 2009 Chen Liqin <liqin.chen@sunplusct.com>
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* Copyright (C) 2012 Regents of the University of California
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* Copyright (C) 2017 SiFive
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* Copyright (C) 2017 XiaojingZhu <zhuxiaoj@ict.ac.cn>
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*/
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#ifndef _ASM_RISCV_PAGE_H
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#define _ASM_RISCV_PAGE_H
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#include <linux/pfn.h>
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#include <linux/const.h>
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#define PAGE_SHIFT (12)
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#define PAGE_SIZE (_AC(1, UL) << PAGE_SHIFT)
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#define PAGE_MASK (~(PAGE_SIZE - 1))
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#ifdef CONFIG_64BIT
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#define HUGE_MAX_HSTATE 2
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#else
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#define HUGE_MAX_HSTATE 1
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#endif
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#define HPAGE_SHIFT PMD_SHIFT
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#define HPAGE_SIZE (_AC(1, UL) << HPAGE_SHIFT)
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#define HPAGE_MASK (~(HPAGE_SIZE - 1))
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#define HUGETLB_PAGE_ORDER (HPAGE_SHIFT - PAGE_SHIFT)
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/*
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* PAGE_OFFSET -- the first address of the first page of memory.
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* When not using MMU this corresponds to the first free page in
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* physical memory (aligned on a page boundary).
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*/
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#define PAGE_OFFSET _AC(CONFIG_PAGE_OFFSET, UL)
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#define KERN_VIRT_SIZE (-PAGE_OFFSET)
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#ifndef __ASSEMBLY__
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#define PAGE_UP(addr) (((addr)+((PAGE_SIZE)-1))&(~((PAGE_SIZE)-1)))
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#define PAGE_DOWN(addr) ((addr)&(~((PAGE_SIZE)-1)))
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/* align addr on a size boundary - adjust address up/down if needed */
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#define _ALIGN_UP(addr, size) (((addr)+((size)-1))&(~((size)-1)))
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#define _ALIGN_DOWN(addr, size) ((addr)&(~((size)-1)))
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/* align addr on a size boundary - adjust address up if needed */
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#define _ALIGN(addr, size) _ALIGN_UP(addr, size)
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#define clear_page(pgaddr) memset((pgaddr), 0, PAGE_SIZE)
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#define copy_page(to, from) memcpy((to), (from), PAGE_SIZE)
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#define clear_user_page(pgaddr, vaddr, page) memset((pgaddr), 0, PAGE_SIZE)
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#define copy_user_page(vto, vfrom, vaddr, topg) \
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memcpy((vto), (vfrom), PAGE_SIZE)
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/*
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* Use struct definitions to apply C type checking
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*/
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/* Page Global Directory entry */
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typedef struct {
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unsigned long pgd;
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} pgd_t;
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/* Page Table entry */
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typedef struct {
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unsigned long pte;
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} pte_t;
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typedef struct {
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unsigned long pgprot;
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} pgprot_t;
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typedef struct page *pgtable_t;
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#define pte_val(x) ((x).pte)
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#define pgd_val(x) ((x).pgd)
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#define pgprot_val(x) ((x).pgprot)
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#define __pte(x) ((pte_t) { (x) })
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#define __pgd(x) ((pgd_t) { (x) })
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#define __pgprot(x) ((pgprot_t) { (x) })
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#ifdef CONFIG_64BIT
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#define PTE_FMT "%016lx"
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#else
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#define PTE_FMT "%08lx"
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#endif
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#ifdef CONFIG_MMU
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extern unsigned long va_pa_offset;
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extern unsigned long pfn_base;
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#define ARCH_PFN_OFFSET (pfn_base)
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#else
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#define va_pa_offset 0
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#define ARCH_PFN_OFFSET (PAGE_OFFSET >> PAGE_SHIFT)
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#endif /* CONFIG_MMU */
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extern unsigned long max_low_pfn;
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extern unsigned long min_low_pfn;
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#define __pa(x) ((unsigned long)(x) - va_pa_offset)
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#define __va(x) ((void *)((unsigned long) (x) + va_pa_offset))
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#define phys_to_pfn(phys) (PFN_DOWN(phys))
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#define pfn_to_phys(pfn) (PFN_PHYS(pfn))
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#define virt_to_pfn(vaddr) (phys_to_pfn(__pa(vaddr)))
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#define pfn_to_virt(pfn) (__va(pfn_to_phys(pfn)))
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#define virt_to_page(vaddr) (pfn_to_page(virt_to_pfn(vaddr)))
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#define page_to_virt(page) (pfn_to_virt(page_to_pfn(page)))
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#define page_to_phys(page) (pfn_to_phys(page_to_pfn(page)))
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#define page_to_bus(page) (page_to_phys(page))
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#define phys_to_page(paddr) (pfn_to_page(phys_to_pfn(paddr)))
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#ifdef CONFIG_FLATMEM
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#define pfn_valid(pfn) \
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(((pfn) >= ARCH_PFN_OFFSET) && (((pfn) - ARCH_PFN_OFFSET) < max_mapnr))
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#endif
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#endif /* __ASSEMBLY__ */
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#define virt_addr_valid(vaddr) (pfn_valid(virt_to_pfn(vaddr)))
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#define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | \
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VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
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#include <asm-generic/memory_model.h>
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#include <asm-generic/getorder.h>
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#endif /* _ASM_RISCV_PAGE_H */
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