35,10 → 35,12 |
#include <proc/scheduler.h> |
#include <proc/thread.h> |
#include <arch.h> |
#include <arch/asm.h> |
#include <arch/mm/tlb.h> |
#include <arch/mm/page.h> |
#include <config.h> |
#include <align.h> |
#include <macros.h> |
|
/** Perform sparc64 specific tasks needed before the new task is run. */ |
void before_task_runs_arch(void) |
45,7 → 47,11 |
{ |
} |
|
/** Ensure that thread's kernel stack is locked in TLB. */ |
/** Perform sparc64 specific steps before scheduling a thread. |
* |
* Ensure that thread's kernel stack, as well as userspace window |
* buffer for userspace threads, are locked in DTLB. |
*/ |
void before_thread_runs_arch(void) |
{ |
uintptr_t base; |
52,18 → 58,38 |
|
base = ALIGN_DOWN(config.base, 1<<KERNEL_PAGE_WIDTH); |
|
if ((uintptr_t) THREAD->kstack < base || (uintptr_t) THREAD->kstack > base + (1<<KERNEL_PAGE_WIDTH)) { |
if (!overlaps((uintptr_t) THREAD->kstack, PAGE_SIZE, base, (1<<KERNEL_PAGE_WIDTH))) { |
/* |
* Kernel stack of this thread is not locked in DTLB. |
* First, make sure it is not mapped already. |
* If not, create a locked mapping for it. |
*/ |
dtlb_demap(TLB_DEMAP_PAGE, TLB_DEMAP_NUCLEUS, (uintptr_t) THREAD->kstack); |
dtlb_insert_mapping((uintptr_t) THREAD->kstack, KA2PA(THREAD->kstack), PAGESIZE_8K, true, true); |
} |
dtlb_demap(TLB_DEMAP_PAGE, TLB_DEMAP_NUCLEUS, (uintptr_t) THREAD->kstack); |
dtlb_insert_mapping((uintptr_t) THREAD->kstack, KA2PA(THREAD->kstack), PAGESIZE_8K, true, true); |
} |
|
if ((THREAD->flags & THREAD_FLAG_USPACE)) { |
/* |
* If this thread executes also in userspace, we have to lock |
* its userspace window buffer into DTLB. |
*/ |
ASSERT(THREAD->arch.uspace_window_buffer); |
uintptr_t uw_buf = (uintptr_t) THREAD->arch.uspace_window_buffer; |
if (!overlaps(uw_buf, PAGE_SIZE, base, 1<<KERNEL_PAGE_WIDTH)) { |
/* |
* The buffer is not covered by the 4M locked kernel DTLB entry. |
*/ |
dtlb_demap(TLB_DEMAP_PAGE, TLB_DEMAP_NUCLEUS, (uintptr_t) uw_buf); |
dtlb_insert_mapping(uw_buf, KA2PA(uw_buf), PAGESIZE_8K, true, true); |
} |
} |
} |
|
/** Unlock thread's stack from TLB, if necessary. */ |
/** Perform sparc64 specific steps before a thread stops running. |
* |
* Demap any locked DTLB entries isntalled by the thread (i.e. kernel stack |
* and userspace window buffer). |
*/ |
void after_thread_ran_arch(void) |
{ |
uintptr_t base; |
70,7 → 96,7 |
|
base = ALIGN_DOWN(config.base, 1<<KERNEL_PAGE_WIDTH); |
|
if ((uintptr_t) THREAD->kstack < base || (uintptr_t) THREAD->kstack > base + (1<<KERNEL_PAGE_WIDTH)) { |
if (!overlaps((uintptr_t) THREAD->kstack, PAGE_SIZE, base, (1<<KERNEL_PAGE_WIDTH))) { |
/* |
* Kernel stack of this thread is locked in DTLB. |
* Destroy the mapping. |
77,6 → 103,27 |
*/ |
dtlb_demap(TLB_DEMAP_PAGE, TLB_DEMAP_NUCLEUS, (uintptr_t) THREAD->kstack); |
} |
|
if ((THREAD->flags & THREAD_FLAG_USPACE)) { |
/* |
* If this thread executes also in userspace, we have to force all |
* its still-active userspace windows into the userspace window buffer |
* and demap the buffer from DTLB. |
*/ |
ASSERT(THREAD->arch.uspace_window_buffer); |
|
flushw(); /* force all userspace windows into memory */ |
|
uintptr_t uw_buf = (uintptr_t) THREAD->arch.uspace_window_buffer; |
if (!overlaps(uw_buf, PAGE_SIZE, base, 1<<KERNEL_PAGE_WIDTH)) { |
/* |
* The buffer is not covered by the 4M locked kernel DTLB entry |
* and therefore it was given a dedicated locked DTLB entry. |
* Demap it. |
*/ |
dtlb_demap(TLB_DEMAP_PAGE, TLB_DEMAP_NUCLEUS, (uintptr_t) uw_buf); |
} |
} |
} |
|
/** @} |