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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-11 08:27:49 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-11 08:27:49 +0000 |
commit | ace9429bb58fd418f0c81d4c2835699bddf6bde6 (patch) | |
tree | b2d64bc10158fdd5497876388cd68142ca374ed3 /arch/hexagon/include/asm/mem-layout.h | |
parent | Initial commit. (diff) | |
download | linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.tar.xz linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.zip |
Adding upstream version 6.6.15.upstream/6.6.15
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'arch/hexagon/include/asm/mem-layout.h')
-rw-r--r-- | arch/hexagon/include/asm/mem-layout.h | 107 |
1 files changed, 107 insertions, 0 deletions
diff --git a/arch/hexagon/include/asm/mem-layout.h b/arch/hexagon/include/asm/mem-layout.h new file mode 100644 index 0000000000..e2f99413fe --- /dev/null +++ b/arch/hexagon/include/asm/mem-layout.h @@ -0,0 +1,107 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * Memory layout definitions for the Hexagon architecture + * + * Copyright (c) 2010-2013, The Linux Foundation. All rights reserved. + */ + +#ifndef _ASM_HEXAGON_MEM_LAYOUT_H +#define _ASM_HEXAGON_MEM_LAYOUT_H + +#include <linux/const.h> + +/* + * Have to do this for ginormous numbers, else they get printed as + * negative numbers, which the linker no likey when you try to + * assign it to the location counter. + */ + +#define PAGE_OFFSET _AC(0xc0000000, UL) + +/* + * Compiling for a platform that needs a crazy physical offset + * (like if the memory starts at 1GB and up) means we need + * an actual PHYS_OFFSET. Should be set up in head.S. + */ + +#ifdef CONFIG_HEXAGON_PHYS_OFFSET +#ifndef __ASSEMBLY__ +extern unsigned long __phys_offset; +#endif +#define PHYS_OFFSET __phys_offset +#endif + +#ifndef PHYS_OFFSET +#define PHYS_OFFSET 0 +#endif + +#define PHYS_PFN_OFFSET (PHYS_OFFSET >> PAGE_SHIFT) +#define ARCH_PFN_OFFSET PHYS_PFN_OFFSET + +#define TASK_SIZE (PAGE_OFFSET) + +/* not sure how these are used yet */ +#define STACK_TOP TASK_SIZE +#define STACK_TOP_MAX TASK_SIZE + +#ifndef __ASSEMBLY__ +enum fixed_addresses { + FIX_KMAP_BEGIN, + FIX_KMAP_END, /* check for per-cpuism */ + __end_of_fixed_addresses +}; + +#define MIN_KERNEL_SEG (PAGE_OFFSET >> PGDIR_SHIFT) /* L1 shift is 22 bits */ +extern int max_kernel_seg; + +/* + * Start of vmalloc virtual address space for kernel; + * supposed to be based on the amount of physical memory available + */ + +#define VMALLOC_START ((unsigned long) __va(high_memory + VMALLOC_OFFSET)) + +/* Gap between physical ram and vmalloc space for guard purposes. */ +#define VMALLOC_OFFSET PAGE_SIZE + +/* + * Create the space between VMALLOC_START and FIXADDR_TOP backwards + * from the ... "top". + * + * Permanent IO mappings will live at 0xfexx_xxxx + * Hypervisor occupies the last 16MB page at 0xffxxxxxx + */ + +#define FIXADDR_TOP 0xfe000000 +#define FIXADDR_SIZE (__end_of_fixed_addresses << PAGE_SHIFT) +#define FIXADDR_START (FIXADDR_TOP - FIXADDR_SIZE) + +/* + * "permanent kernel mappings", defined as long-lasting mappings of + * high-memory page frames into the kernel address space. + */ + +#define LAST_PKMAP PTRS_PER_PTE +#define LAST_PKMAP_MASK (LAST_PKMAP - 1) +#define PKMAP_NR(virt) ((virt - PKMAP_BASE) >> PAGE_SHIFT) +#define PKMAP_ADDR(nr) (PKMAP_BASE + ((nr) << PAGE_SHIFT)) + +/* + * To the "left" of the fixed map space is the kmap space + * + * "Permanent Kernel Mappings"; fancy (or less fancy) PTE table + * that looks like it's actually walked. + * Need to check the alignment/shift usage; some archs use + * PMD_MASK on this value + */ +#define PKMAP_BASE (FIXADDR_START-PAGE_SIZE*LAST_PKMAP) + +/* + * 2 pages of guard gap between where vmalloc area ends + * and pkmap_base begins. + */ +#define VMALLOC_END (PKMAP_BASE-PAGE_SIZE*2) +#endif /* !__ASSEMBLY__ */ + + +#endif /* _ASM_HEXAGON_MEM_LAYOUT_H */ |