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* Enable the use of the FXSAVE and FXRSTOR instructions, see Intel SDM
Vol. 3C, section 2.5.
* The state of the x87 floating point unit (FPU) is loaded and saved on
demand.
* Make the cr0 control register accessible in the Cpu class. This is in
preparation of the upcoming FPU management.
* Access to the FPU is disabled by setting the Task Switch flag in the cr0
register.
* Access to the FPU is enabled by clearing the Task Switch flag in the cr0
register.
* Implement FPU initialization
* Add is_fpu_enabled helper function
* Add pointer to CPU lazy state to CPU class
* Init FPU when finishing kernel initialization
* Add function to retry FPU instruction:
Similar to the ARM mechanism to retry undefined instructions, implement a
function for retrying an FPU instruction. If a floating-point instruction
causes an #NM exception due to the FPU being disabled, it can be retried
after the correct FPU state is restored, saving the current state and
enabling the FPU in the process.
* Disable FPU when switching to different user context:
This enables lazy save/restore of the FPU since trying to execute a
floating point instruction when the FPU is disabled will cause a #NM
exception.
* Declare constant for #NM exception
* Retry FPU instruction on #NM exception
* Assure alignment of FXSAVE area:
The FXSAVE area is 512-byte memory region that must be 16-byte aligned. As
it turns out the alignment attribute is not honored in all cases so add a
workaround to assure the alignment constraint is met by manually rounding
the start of the FXSAVE area to the next 16-byte boundary if necessary.
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|---|---|---|
| .. | ||
| 32bit/base | ||
| 64bit/base | ||
| arm | ||
| arm_v5/cpu | ||
| arm_v6/cpu | ||
| arm_v7/cpu | ||
| base | ||
| cap_session | ||
| cpu | ||
| cpu_session | ||
| dataspace | ||
| drivers | ||
| io_mem_session | ||
| io_port_session | ||
| irq_session | ||
| log_session | ||
| pager | ||
| parent | ||
| pd_session | ||
| platform | ||
| platform_exynos5 | ||
| ram_session | ||
| rm_session | ||
| rom_session | ||
| root | ||
| session | ||
| signal_session | ||
| thread | ||
| trace_session | ||
| util | ||
| x86/cpu | ||
| x86_32/cpu | ||
| x86_64/cpu | ||
| README | ||
This directory contains include files of interfaces that are exported by components to be used by other components. Each subdirectory corresponds to the component exporting the interface.