Changeset 624 for trunk/hal/generic

Timestamp:

Mar 12, 2019, 1:37:38 PM (6 years ago)

Author:

alain

Message:

Fix several bugs to use the instruction MMU in kernel mode
in replacement of the instruction address extension register,
and remove the "kentry" segment.

This version is running on the tsar_generic_iob" platform.

One interesting bug: the cp0_ebase defining the kernel entry point
(for interrupts, exceptions and syscalls) must be initialized
early in kernel_init(), because the VFS initialisation done by
kernel_ini() uses RPCs, and RPCs uses Inter-Processor-Interrup.

Location:

trunk/hal/generic

Files:

• hal_gpt.h (modified) (2 diffs)
• hal_special.h (modified) (1 diff)

trunk/hal/generic/hal_gpt.h

@@ -56 +56 @@
 #define GPT_CACHABLE    0x0020       /*! PTE can be cached                             */
 #define GPT_USER        0x0040       /*! PTE is user accessible                        */
-#define GPT_DIRTY       0x0080       /*! PTE has been "recently" written               */
+#define GPT_DIRTY       0x0080       /*! PTE has been written                          */
 #define GPT_ACCESSED    0x0100       /*! PTE has been "recently" accessed              */
 #define GPT_GLOBAL      0x0200       /*! PTE is kept in TLB at context switch          */
@@ -142 +142 @@
 
 /****************************************************************************************
- * This function unmaps a page table entry identified by the <vpn> argument in the 
- * local GPT identified by the <gpt> argument.
- * It does NOT release the physical memory allocated for the unmapped page.
- ****************************************************************************************
- * @ gpt       : [in] pointer on the local page table
- * @ vpn       : [in] virtual page number
+ * This function unmaps all pages identified by the <vpn> argument from the local GPT
+ * identified by the <gpt> argument.
+ * It does NOT release the physical memory allocated for the unmapped pages.
+ ****************************************************************************************
+ * @ gpt      : [in] pointer on the local page table
+ * @ vpn      : [in] page index in virtual space
  ***************************************************************************************/
 void hal_gpt_reset_pte( gpt_t * gpt,

trunk/hal/generic/hal_special.h

@@ -46 +46 @@
 
 /*****************************************************************************************
- * This function initializes - for architectures requiring it - the MMU registers 
- * as required by the target architecture to execute the kernel threads attached
- * to kernel process zero. It is called by all cores in the kernel_init() function.
+ * This function initializes - for architectures requiring it - the MMU registers of the
+ * calling core to use the the kernel page table identified by the <gpt> argument for
+ * all threads attached to kernel process_zero. 
+ * It is called by all cores in the kernel_init() function.
  *****************************************************************************************
  * @ gpt :  local pointer on the kernel page table descriptor.