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arch/x86: (Intel64) use TSS for per-CPU variables

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A space is allocated in the TSS for per-CPU variables. At present,
this is only a 'struct _cpu *' to find the _kernel CPU struct. The
locore routines are rewritten to find _current and _nested via this
pointer rather than referencing the _kernel global directly.

This is obviously in preparation for SMP support.

Signed-off-by: Charles E. Youse <charles.youse@intel.com>
This commit is contained in:
Charles E. Youse 2019-09-23 12:47:47 -04:00 • committed by Andrew Boie
commit 32fc239aa2
4 changed files with 21 additions and 11 deletions
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4
arch/x86/core/intel64/tss.c
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@ -6,6 +6,7 @@
#include <kernel.h>
#include <kernel_arch_data.h>
#include <kernel_arch_func.h>
#include <kernel_structs.h>
extern u8_t _exception_stack[];
@ -13,6 +14,7 @@ Z_GENERIC_SECTION(.tss)
struct x86_tss64 tss0 = {
.ist1 = (u64_t) _interrupt_stack + CONFIG_ISR_STACK_SIZE,
.ist7 = (u64_t) _exception_stack + CONFIG_EXCEPTION_STACK_SIZE,
.iomapb = 0xFFFF, /* no I/O access bitmap */
.iomapb = 0xFFFF /* no I/O access bitmap */
.cpu = &(_kernel.cpus[0])
};