Defines the TLB bitmap to be located, virtually, just below the kernel
window. To get an initialized bitmap in each new address space we
change copyGlobalMappings to copy from USER_TOP (which includes the
initialized TLB bitmap in the global address space) instead of just
the kernel window base
This commit adds support for using the ThreadID registers of the ARM MPCore
platforms for storing the address of the IPC buffer instead of the globals
frame. The choice of using the user readable/writeable ThreadID register
is chosen, even though it means the user cannot use it for its own
purposes, as it leaves room in the future for doing TLS support in the
user read only register, where compilers expect it.
This commit adds support for saving/restoring an additional register
that exists on ARM MPCore platforms. As this register is user wrieable,
as well as readable, it must saved and restored by the kernel to
prevent gross information channels.
Although this function is called from the fastpath inside of an
`unlikely` macro and the function itself gets inlined, the knowledge
that this conjunction is unlikely is somehow lost. Explicitly putting
a `likely` here fixes it
Removes the recycle operation and adds an operation
to cancel any badged sends on and endpoint. Calling
Revoke + CancelBadgedSend is equivalent to Recycle
on a badged endpoint
This removes usages of CONST Arch_activateIdleThread. According to
gcc 'a function that has pointer arguments and examines the data
pointed to must not be declared const'. Whilst these functions do
not presently examine their tcb_t pointer argument, it seems
pointless to pass something that can never be safely looked at.
Further a function that returns void and is CONST is utterly meaningless
This commit does the following:
* invert the bit field scheduler for better cache performance for high priority threads
* peeks into the bitfield scheduler to allow fastpath to be leveraged when IPC occurs from lo --> hi priority threads if correct
Previously generic functions for manipulating page table and page
directory entries were placed in mode/structures.h. These are moved
to a mode/vspace.h instead so that they can use existing functions
defined in arch/vspace.h.
The x86_make_pde_mapping function is dropped in this move as it is
not used. Instead it is replaced with a function for creating an
empty mapping for whatever is the vspace root.
1. Missing loop counter when accessing to PD in 'tlb_bitmap_get'.
2. Missing 'TLBBITMAP_PD_INDEX' in 'TLBBITMAP_PD_MAKE_INDEX'. The index generated by 'TLBBITMAP_PD_MAKE_INDEX' should be valid in PD while the original one used to generate just 0, 1, etc. The correct index is '0 + TLBBITMAP_PD_INDEX', '1 + TLBBITMAP_PD_INDEX' and so on.
When checking if a thread is using the FPU or not we now check on that
threads core, under the assumption that if a thread migrates its FPU
state is explicitly (and not lazily) migrated.
Change to the order of operations and timing behaviour of
invokeUntyped_Retype. The Retype operation now zeroes the
entire range of the Untyped cap (if it is being used for
the first time) before installing any objects. This avoids
the need for long-running initialisation of large objects,
whose initial contents are always zero. The initial zeroing
phase is preemptible, and may take multiple timeslices to
complete.
