forked from Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
104 lines
2.3 KiB
104 lines
2.3 KiB
// SPDX-License-Identifier: GPL-2.0 |
|
#include <linux/sched.h> |
|
#include <linux/kernel.h> |
|
#include <linux/errno.h> |
|
#include <linux/mm.h> |
|
#include <linux/nmi.h> |
|
#include <linux/swap.h> |
|
#include <linux/smp.h> |
|
#include <linux/highmem.h> |
|
#include <linux/pagemap.h> |
|
#include <linux/spinlock.h> |
|
|
|
#include <asm/cpu_entry_area.h> |
|
#include <asm/fixmap.h> |
|
#include <asm/e820/api.h> |
|
#include <asm/tlb.h> |
|
#include <asm/tlbflush.h> |
|
#include <asm/io.h> |
|
#include <linux/vmalloc.h> |
|
|
|
unsigned int __VMALLOC_RESERVE = 128 << 20; |
|
|
|
/* |
|
* Associate a virtual page frame with a given physical page frame |
|
* and protection flags for that frame. |
|
*/ |
|
void set_pte_vaddr(unsigned long vaddr, pte_t pteval) |
|
{ |
|
pgd_t *pgd; |
|
p4d_t *p4d; |
|
pud_t *pud; |
|
pmd_t *pmd; |
|
pte_t *pte; |
|
|
|
pgd = swapper_pg_dir + pgd_index(vaddr); |
|
if (pgd_none(*pgd)) { |
|
BUG(); |
|
return; |
|
} |
|
p4d = p4d_offset(pgd, vaddr); |
|
if (p4d_none(*p4d)) { |
|
BUG(); |
|
return; |
|
} |
|
pud = pud_offset(p4d, vaddr); |
|
if (pud_none(*pud)) { |
|
BUG(); |
|
return; |
|
} |
|
pmd = pmd_offset(pud, vaddr); |
|
if (pmd_none(*pmd)) { |
|
BUG(); |
|
return; |
|
} |
|
pte = pte_offset_kernel(pmd, vaddr); |
|
if (!pte_none(pteval)) |
|
set_pte_at(&init_mm, vaddr, pte, pteval); |
|
else |
|
pte_clear(&init_mm, vaddr, pte); |
|
|
|
/* |
|
* It's enough to flush this one mapping. |
|
* (PGE mappings get flushed as well) |
|
*/ |
|
flush_tlb_one_kernel(vaddr); |
|
} |
|
|
|
unsigned long __FIXADDR_TOP = 0xfffff000; |
|
EXPORT_SYMBOL(__FIXADDR_TOP); |
|
|
|
/* |
|
* vmalloc=size forces the vmalloc area to be exactly 'size' |
|
* bytes. This can be used to increase (or decrease) the |
|
* vmalloc area - the default is 128m. |
|
*/ |
|
static int __init parse_vmalloc(char *arg) |
|
{ |
|
if (!arg) |
|
return -EINVAL; |
|
|
|
/* Add VMALLOC_OFFSET to the parsed value due to vm area guard hole*/ |
|
__VMALLOC_RESERVE = memparse(arg, &arg) + VMALLOC_OFFSET; |
|
return 0; |
|
} |
|
early_param("vmalloc", parse_vmalloc); |
|
|
|
/* |
|
* reservetop=size reserves a hole at the top of the kernel address space which |
|
* a hypervisor can load into later. Needed for dynamically loaded hypervisors, |
|
* so relocating the fixmap can be done before paging initialization. |
|
*/ |
|
static int __init parse_reservetop(char *arg) |
|
{ |
|
unsigned long address; |
|
|
|
if (!arg) |
|
return -EINVAL; |
|
|
|
address = memparse(arg, &arg); |
|
reserve_top_address(address); |
|
early_ioremap_init(); |
|
return 0; |
|
} |
|
early_param("reservetop", parse_reservetop);
|
|
|