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Enable paging - some more code reshuffling

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This commit is contained in:
Tomas Hruby
2010-09-15 14:09:41 +00:00
parent 6c3b981cd6
commit ce4fd0c0fb
3 changed files with 26 additions and 28 deletions
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47
kernel/arch/i386/memory.c
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@@ -38,32 +38,11 @@ FORWARD _PROTOTYPE( u32_t phys_get32, (phys_bytes v) );
FORWARD _PROTOTYPE( void vm_enable_paging, (void) );
/* *** Internal VM Functions *** */
PUBLIC void vm_init(struct proc *newptproc)
PUBLIC void segmentation2paging(struct proc * current)
{
if(vm_running)
panic("vm_init: vm_running");
/* switch_address_space() checks what is in cr3, and doesn't do
* anything if it's the same as the cr3 of its argument, newptproc.
* If MINIX was previously booted, this could very well be the case.
*
* The first time switch_address_space() is called, we want to
* force it to do something (load cr3 and set newptproc), so we
* zero cr3, and force paging off to make that a safe thing to do.
*
* After that, vm_enable_paging() enables paging with the page table
* of newptproc loaded.
*/
vm_stop();
write_cr3(0);
switch_address_space(newptproc);
assert(ptproc == newptproc);
catch_pagefaults = 0;
/* switch to the current process page tables before turning paging on */
switch_address_space(current);
vm_enable_paging();
vm_running = 1;
}
/* This function sets up a mapping from within the kernel's address
@@ -1042,6 +1021,26 @@ PUBLIC int arch_enable_paging(struct proc * caller, const message * m_ptr)
struct vm_ep_data ep_data;
int r;
/* switch_address_space() checks what is in cr3, and do nothing if it's
* the same as the cr3 of its argument, newptproc. If MINIX was
* previously booted, this could very well be the case.
*
* The first time switch_address_space() is called, we want to
* force it to do something (load cr3 and set newptproc), so we
* zero cr3, and force paging off to make that a safe thing to do.
*
* After that, segmentation2paging() enables paging with the page table
* of caller loaded.
*/
vm_stop();
write_cr3(0);
/* switch from segmentation only to paging */
segmentation2paging(caller);
vm_running = 1;
/*
* copy the extra data associated with the call from userspace
*/