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Update comments: paging is initialized in pmap_cold().

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MFC after:	3 days
Sponsored by:	The FreeBSD Foundation
This commit is contained in:
Konstantin Belousov 2018-12-31 18:05:48 +00:00
parent 584e31851a
commit e68d443853
1 changed files with 10 additions and 9 deletions
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19
sys/i386/i386/pmap.c
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@ -569,9 +569,9 @@ pmap_cold(void)
/*
* Bootstrap the system enough to run with virtual memory.
*
* On the i386 this is called after mapping has already been enabled
* in locore.s with the page table created in pmap_cold(),
* and just syncs the pmap module with what has already been done.
* On the i386 this is called after pmap_cold() created intial
* kernel page table and enabled paging, and just syncs the pmap
* module with what has already been done.
*/
void
pmap_bootstrap(vm_paddr_t firstaddr)
@ -594,11 +594,12 @@ pmap_bootstrap(vm_paddr_t firstaddr)
vm_phys_add_seg(KPTphys, KPTphys + ptoa(nkpt));
/*
* Initialize the first available kernel virtual address. However,
* using "firstaddr" may waste a few pages of the kernel virtual
* address space, because locore may not have mapped every physical
* page that it allocated. Preferably, locore would provide a first
* unused virtual address in addition to "firstaddr".
* Initialize the first available kernel virtual address.
* However, using "firstaddr" may waste a few pages of the
* kernel virtual address space, because pmap_cold() may not
* have mapped every physical page that it allocated.
* Preferably, pmap_cold() would provide a first unused
* virtual address in addition to "firstaddr".
*/
virtual_avail = (vm_offset_t)firstaddr;
virtual_end = VM_MAX_KERNEL_ADDRESS;
@ -665,7 +666,7 @@ pmap_bootstrap(vm_paddr_t firstaddr)
/*
* KPTmap is used by pmap_kextract().
*
* KPTmap is first initialized by locore. However, that initial
* KPTmap is first initialized by pmap_cold(). However, that initial
* KPTmap can only support NKPT page table pages. Here, a larger
* KPTmap is created that can support KVA_PAGES page table pages.
*/