Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  1) /* SPDX-License-Identifier: GPL-2.0 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  3)  * highmem.h: virtual kernel memory mappings for high memory
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  4)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  5)  * Used in CONFIG_HIGHMEM systems for memory pages which
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  6)  * are not addressable by direct kernel virtual addresses.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  7)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  8)  * Copyright (C) 1999 Gerhard Wichert, Siemens AG
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  9)  *		      Gerhard.Wichert@pdb.siemens.de
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12)  * Redesigned the x86 32-bit VM architecture to deal with
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13)  * up to 16 Terabyte physical memory. With current x86 CPUs
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14)  * we now support up to 64 Gigabytes physical RAM.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16)  * Copyright (C) 1999 Ingo Molnar <mingo@redhat.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #ifndef _ASM_HIGHMEM_H
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #define _ASM_HIGHMEM_H
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #ifdef __KERNEL__
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) #include <linux/interrupt.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) #include <linux/uaccess.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) #include <asm/fixmap.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) extern pte_t *kmap_pte;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) extern pte_t *pkmap_page_table;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32)  * Right now we initialize only a single pte table. It can be extended
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33)  * easily, subsequent pte tables have to be allocated in one physical
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34)  * chunk of RAM.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37)  * We use one full pte table with 4K pages. And with 16K/64K/256K pages pte
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38)  * table covers enough memory (32MB/512MB/2GB resp.), so that both FIXMAP
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39)  * and PKMAP can be placed in a single pte table. We use 512 pages for PKMAP
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40)  * in case of 16K/64K/256K page sizes.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) #define PKMAP_ORDER	PTE_SHIFT
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) #define LAST_PKMAP	(1 << PKMAP_ORDER)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) #define PKMAP_BASE	((FIXADDR_START - PAGE_SIZE * (LAST_PKMAP + 1)) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) 								& PMD_MASK)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) #define LAST_PKMAP_MASK	(LAST_PKMAP - 1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) #define PKMAP_NR(virt)  ((virt - PKMAP_BASE) >> PAGE_SHIFT)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) #define PKMAP_ADDR(nr)  (PKMAP_BASE + ((nr) << PAGE_SHIFT))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) #define flush_cache_kmaps()	{ flush_icache(); flush_dcache(); }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) #endif /* __KERNEL__ */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) #endif /* _ASM_HIGHMEM_H */