Changeset 407 for trunk/tools/bootloader_tsar

Timestamp:

Nov 7, 2017, 3:08:12 PM (6 years ago)

Author:

alain

Message:

First implementation of fork/exec.

File:

• trunk/tools/bootloader_tsar/boot.c (modified) (7 diffs)

trunk/tools/bootloader_tsar/boot.c

@@ -807 +807 @@
             }
 
-            boot_printf("\n[BOOT] core[%x,%d] loaded boot_info at cycle %d\n",
+            boot_printf("\n[BOOT] core[%x,%d] loaded arch_info at cycle %d\n",
                         cxy , lid , boot_get_proctime() );
 
@@ -901 +901 @@
 
 // display address extensions
-uint32_t cp2_data_ext;
-uint32_t cp2_ins_ext;
-asm volatile( "mfc2   %0,  $24" : "=&r" (cp2_data_ext) );
-asm volatile( "mfc2   %0,  $25" : "=&r" (cp2_ins_ext) );
-boot_printf("\n[BOOT] core[%x,%d] CP2_DATA_EXT = %x / CP2_INS_EXT = %x\n",
-            cxy , lid , cp2_data_ext , cp2_ins_ext );
+// uint32_t cp2_data_ext;
+// uint32_t cp2_ins_ext;
+// asm volatile( "mfc2   %0,  $24" : "=&r" (cp2_data_ext) );
+// asm volatile( "mfc2   %0,  $25" : "=&r" (cp2_ins_ext) );
+// boot_printf("\n[BOOT] core[%x,%d] CP2_DATA_EXT = %x / CP2_INS_EXT = %x\n",
+// cxy , lid , cp2_data_ext , cp2_ins_ext );
 
             // Wait until all local cores in cluster ready
@@ -930 +930 @@
 
 // display address extensions
-uint32_t cp2_data_ext;
-uint32_t cp2_ins_ext;
-asm volatile( "mfc2   %0,  $24" : "=&r" (cp2_data_ext) );
-asm volatile( "mfc2   %0,  $25" : "=&r" (cp2_ins_ext) );
-boot_printf("\n[BOOT] core[%x,%d] CP2_DATA_EXT = %x / CP2_INS_EXT = %x\n",
-            cxy , lid , cp2_data_ext , cp2_ins_ext );
+// uint32_t cp2_data_ext;
+// uint32_t cp2_ins_ext;
+// asm volatile( "mfc2   %0,  $24" : "=&r" (cp2_data_ext) );
+// asm volatile( "mfc2   %0,  $25" : "=&r" (cp2_ins_ext) );
+// boot_printf("\n[BOOT] core[%x,%d] CP2_DATA_EXT = %x / CP2_INS_EXT = %x\n",
+// cxy , lid , cp2_data_ext , cp2_ins_ext );
 
         // Wait until all local cores in cluster ready
@@ -941 +941 @@
     }
 
-    // Ech core compute stack pointer to the kernel idle-thread descriptor.
+    // Each core initialise the following registers before jumping to kernel: 
+    // - sp_29    : stack pointer on idle thread,
+    // - c0_sr    : reset BEV bit
+    // - a0_04    : pointer on boot_info structure
+    // - c0_ebase : kentry_base(and jump to kernel_entry. 
+
     // The array of idle-thread descriptors is allocated in the kdata segment,
     // just after the boot_info structure
-
     uint32_t sp;
     uint32_t base;
@@ -951 +955 @@
     uint32_t psize  = CONFIG_PPM_PAGE_SIZE;
 
-
     // compute base address of idle thread descriptors array
     if( offset & pmask ) base = seg_kdata_base + (offset & ~pmask) + psize;
@@ -959 +962 @@
     sp = base + ((lid + 1) * CONFIG_THREAD_DESC_SIZE) - 16;
 
-    // Each cores initialise stack pointer,
-    // reset the BEV bit in status register,
-    // register "boot_info" argument in a0,
-    // and jump to kernel_entry. 
     asm volatile( "mfc0  $27,  $12           \n"
                   "lui   $26,  0xFFBF        \n"
@@ -970 +969 @@
                   "move  $4,   %0            \n"
                   "move  $29,  %1            \n"
-                  "jr    %2                  \n"
-                  :: "r"(boot_info) , "r"(sp) , "r"(kernel_entry) );
+                  "mtc0  %2,   $15,  1       \n"
+                  "jr    %3                  \n"
+                  :: "r"(boot_info) ,
+                     "r"(sp) ,
+                     "r"(boot_info->kentry_base),
+                     "r"(kernel_entry) ); 
 
 } // boot_loader()