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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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8
arch/x86/include/ia32/kernel_arch_func.h
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@ -44,14 +44,6 @@ void z_x86_thread_pt_init(struct k_thread *thread);
void z_x86_apply_mem_domain(struct x86_page_tables *ptables,
struct k_mem_domain *mem_domain);
static inline struct x86_page_tables *
z_x86_thread_page_tables_get(struct k_thread *thread)
{
struct z_x86_thread_stack_header *header =
(struct z_x86_thread_stack_header *)thread->stack_obj;
return &header->kernel_data.ptables;
}
#endif /* CONFIG_USERSPACE */
/* ASM code to fiddle with registers to enable the MMU with PAE paging */