Changeset 623 for trunk/hal/tsar_mips32/core/hal_special.c

Timestamp:

Mar 6, 2019, 4:37:15 PM (5 years ago)

Author:

alain

Message:

Introduce three new types of vsegs (KCODE,KDATA,KDEV)
to map the kernel vsegs in the process VSL and GPT.
This now used by both the TSAR and the I86 architectures.

File:

• trunk/hal/tsar_mips32/core/hal_special.c (modified) (1 diff)

trunk/hal/tsar_mips32/core/hal_special.c

@@ -33 +33 @@
 struct thread_s;
 
+
+//////////////////////////////////////////////////////////////////////////////////
+//   Extern global variables
+//////////////////////////////////////////////////////////////////////////////////
+
+extern cxy_t local_cxy;
+extern void  hal_kentry_enter( void );
+
+/////////////////////////////////////////////////////////////////////////////////
+// For the TSAR architecture, this function register the physical address of
+// the first level page table (PT1) in the PTPR register.
+// It activates the intructions MMU, and de-activates the data MMU.
+/////////////////////////////////////////////////////////////////////////////////
+void hal_mmu_init( gpt_t * gpt )
+{
+
+    // set PT1 base address in mmu_ptpr register
+    uint32_t ptpr = (((uint32_t)gpt->ptr) >> 13) | (local_cxy << 19);
+    asm volatile ( "mtc2   %0,   $0         \n" : : "r" (ptpr) );
+
+    // set ITLB | ICACHE | DCACHE bits in mmu_mode register 
+    asm volatile ( "ori    $26,  $0,  0xB   \n" 
+                   "mtc2   $26,  $1         \n" );
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// For the TSAR architecture, this function registers the address of the
+// hal_kentry_enter() function in the MIPS32 cp0_ebase register.
+////////////////////////////////////////////////////////////////////////////////
+void hal_set_kentry( void )
+{
+    uint32_t kentry = (uint32_t)(&hal_kentry_enter);
+
+    asm volatile("mtc0   %0,  $15,  1" : : "r" (kentry) );
+}
+
 ////////////////////////////////
 inline gid_t hal_get_gid( void )