1// SPDX-License-Identifier: GPL-2.0
  2#include <linux/sched.h>
  3#include <linux/kernel.h>
  4#include <linux/errno.h>
  5#include <linux/mm.h>
  6#include <linux/nmi.h>
  7#include <linux/swap.h>
  8#include <linux/smp.h>
  9#include <linux/highmem.h>
 10#include <linux/pagemap.h>
 11#include <linux/spinlock.h>
 12
 13#include <asm/cpu_entry_area.h>
 
 
 14#include <asm/fixmap.h>
 15#include <asm/e820/api.h>
 16#include <asm/tlb.h>
 17#include <asm/tlbflush.h>
 18#include <asm/io.h>
 19#include <linux/vmalloc.h>
 20
 21unsigned int __VMALLOC_RESERVE = 128 << 20;
 22
 23/*
 24 * Associate a virtual page frame with a given physical page frame 
 25 * and protection flags for that frame.
 26 */ 
 27void set_pte_vaddr(unsigned long vaddr, pte_t pteval)
 28{
 29	pgd_t *pgd;
 30	p4d_t *p4d;
 31	pud_t *pud;
 32	pmd_t *pmd;
 33	pte_t *pte;
 34
 35	pgd = swapper_pg_dir + pgd_index(vaddr);
 36	if (pgd_none(*pgd)) {
 37		BUG();
 38		return;
 39	}
 40	p4d = p4d_offset(pgd, vaddr);
 41	if (p4d_none(*p4d)) {
 42		BUG();
 43		return;
 44	}
 45	pud = pud_offset(p4d, vaddr);
 46	if (pud_none(*pud)) {
 47		BUG();
 48		return;
 49	}
 50	pmd = pmd_offset(pud, vaddr);
 51	if (pmd_none(*pmd)) {
 52		BUG();
 53		return;
 54	}
 55	pte = pte_offset_kernel(pmd, vaddr);
 56	if (!pte_none(pteval))
 57		set_pte_at(&init_mm, vaddr, pte, pteval);
 58	else
 59		pte_clear(&init_mm, vaddr, pte);
 60
 61	/*
 62	 * It's enough to flush this one mapping.
 63	 * (PGE mappings get flushed as well)
 64	 */
 65	flush_tlb_one_kernel(vaddr);
 66}
 67
 68unsigned long __FIXADDR_TOP = 0xfffff000;
 69EXPORT_SYMBOL(__FIXADDR_TOP);
 70
 71/*
 72 * vmalloc=size forces the vmalloc area to be exactly 'size'
 73 * bytes. This can be used to increase (or decrease) the
 74 * vmalloc area - the default is 128m.
 75 */
 76static int __init parse_vmalloc(char *arg)
 77{
 78	if (!arg)
 79		return -EINVAL;
 80
 81	/* Add VMALLOC_OFFSET to the parsed value due to vm area guard hole*/
 82	__VMALLOC_RESERVE = memparse(arg, &arg) + VMALLOC_OFFSET;
 83	return 0;
 84}
 85early_param("vmalloc", parse_vmalloc);
 86
 87/*
 88 * reservetop=size reserves a hole at the top of the kernel address space which
 89 * a hypervisor can load into later.  Needed for dynamically loaded hypervisors,
 90 * so relocating the fixmap can be done before paging initialization.
 91 */
 92static int __init parse_reservetop(char *arg)
 93{
 94	unsigned long address;
 95
 96	if (!arg)
 97		return -EINVAL;
 98
 99	address = memparse(arg, &arg);
100	reserve_top_address(address);
101	early_ioremap_init();
102	return 0;
103}
104early_param("reservetop", parse_reservetop);

  1// SPDX-License-Identifier: GPL-2.0
  2#include <linux/sched.h>
  3#include <linux/kernel.h>
  4#include <linux/errno.h>
  5#include <linux/mm.h>
  6#include <linux/nmi.h>
  7#include <linux/swap.h>
  8#include <linux/smp.h>
  9#include <linux/highmem.h>
 10#include <linux/pagemap.h>
 11#include <linux/spinlock.h>
 12
 13#include <asm/cpu_entry_area.h>
 14#include <asm/pgtable.h>
 15#include <asm/pgalloc.h>
 16#include <asm/fixmap.h>
 17#include <asm/e820/api.h>
 18#include <asm/tlb.h>
 19#include <asm/tlbflush.h>
 20#include <asm/io.h>
 
 21
 22unsigned int __VMALLOC_RESERVE = 128 << 20;
 23
 24/*
 25 * Associate a virtual page frame with a given physical page frame 
 26 * and protection flags for that frame.
 27 */ 
 28void set_pte_vaddr(unsigned long vaddr, pte_t pteval)
 29{
 30	pgd_t *pgd;
 31	p4d_t *p4d;
 32	pud_t *pud;
 33	pmd_t *pmd;
 34	pte_t *pte;
 35
 36	pgd = swapper_pg_dir + pgd_index(vaddr);
 37	if (pgd_none(*pgd)) {
 38		BUG();
 39		return;
 40	}
 41	p4d = p4d_offset(pgd, vaddr);
 42	if (p4d_none(*p4d)) {
 43		BUG();
 44		return;
 45	}
 46	pud = pud_offset(p4d, vaddr);
 47	if (pud_none(*pud)) {
 48		BUG();
 49		return;
 50	}
 51	pmd = pmd_offset(pud, vaddr);
 52	if (pmd_none(*pmd)) {
 53		BUG();
 54		return;
 55	}
 56	pte = pte_offset_kernel(pmd, vaddr);
 57	if (!pte_none(pteval))
 58		set_pte_at(&init_mm, vaddr, pte, pteval);
 59	else
 60		pte_clear(&init_mm, vaddr, pte);
 61
 62	/*
 63	 * It's enough to flush this one mapping.
 64	 * (PGE mappings get flushed as well)
 65	 */
 66	__flush_tlb_one_kernel(vaddr);
 67}
 68
 69unsigned long __FIXADDR_TOP = 0xfffff000;
 70EXPORT_SYMBOL(__FIXADDR_TOP);
 71
 72/*
 73 * vmalloc=size forces the vmalloc area to be exactly 'size'
 74 * bytes. This can be used to increase (or decrease) the
 75 * vmalloc area - the default is 128m.
 76 */
 77static int __init parse_vmalloc(char *arg)
 78{
 79	if (!arg)
 80		return -EINVAL;
 81
 82	/* Add VMALLOC_OFFSET to the parsed value due to vm area guard hole*/
 83	__VMALLOC_RESERVE = memparse(arg, &arg) + VMALLOC_OFFSET;
 84	return 0;
 85}
 86early_param("vmalloc", parse_vmalloc);
 87
 88/*
 89 * reservetop=size reserves a hole at the top of the kernel address space which
 90 * a hypervisor can load into later.  Needed for dynamically loaded hypervisors,
 91 * so relocating the fixmap can be done before paging initialization.
 92 */
 93static int __init parse_reservetop(char *arg)
 94{
 95	unsigned long address;
 96
 97	if (!arg)
 98		return -EINVAL;
 99
100	address = memparse(arg, &arg);
101	reserve_top_address(address);
102	early_ioremap_init();
103	return 0;
104}
105early_param("reservetop", parse_reservetop);