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x86: optimize locations of psp and thread ptables

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z_x86_thread_page_tables_get() now works for both user
and supervisor threads, returning the kernel page tables
in the latter case. This API has been up-leveled to
a common header.

The per-thread privilege elevation stack initial stack
pointer, and the per-thread page table locations are no
longer computed from other values, and instead are stored
in thread->arch.

A problem where the wrong page tables were dumped out
on certain kinds of page faults has been fixed.

Signed-off-by: Andrew Boie <andrew.p.boie@intel.com>
This commit is contained in:
Andrew Boie 2019-11-19 15:08:49 -08:00 • committed by Anas Nashif
commit 7ea958e0dd
9 changed files with 66 additions and 50 deletions
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13
include/arch/x86/ia32/thread.h
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@ -208,6 +208,19 @@ typedef struct s_preempFloatReg {
struct _thread_arch {
u8_t flags;
#ifdef CONFIG_USERSPACE
/* Pointer to page tables used by this thread. Supervisor threads
* always use the kernel's page table, user thread use per-thread
* tables stored in the stack object
*/
struct x86_page_tables *ptables;
/* Initial privilege mode stack pointer when doing a system call.
* Un-set for supervisor threads.
*/
char *psp;
#endif
#if defined(CONFIG_LAZY_FP_SHARING)
/*
* Nested exception count to maintain setting of EXC_ACTIVE flag across