Changeset 74df77d in mainline for arch/ia32/src/smp

Timestamp:

2005-06-10T16:18:43Z (20 years ago)

Author:

Jakub Jermar <jakub@…>

Branches:

lfn, master, serial, ticket/834-toolchain-update, topic/msim-upgrade, topic/simplify-dev-export

Children:

87cd61f

Parents:

18e0a6c

Message:

Add map_structure() to automate mapping of memory structures that can span multiple pages and/or cross page boundaries.
Change ACPI map_sdt() to use map_structure().

Small changes in MPS code.
The extra frame allocation for accessing frame 0 is unnecessary as it is possible to access frame 0 from kernel address space.
Zero TSS descriptor in the newly prepared GDT.

File:

• arch/ia32/src/smp/mps.c (modified) (3 diffs)

arch/ia32/src/smp/mps.c

@@ -405 +405 @@
         struct __processor_entry *pr;
         __address src, dst;
-        __address frame;
         int i;
 
@@ -417 +416 @@
         /*
          * We need to access data in frame 0.
-         */
-        frame = frame_alloc(0);
-        map_page_to_frame(frame,0,PAGE_CACHEABLE,0);
+         * We boldly make use of kernel address space mapping.
+         */
 
         /*
          * Set the warm-reset vector to the real-mode address of 4K-aligned ap_boot()
          */
-        *((__u16 *) (frame + 0x467+0)) =  ((__address) ap_boot) >> 4;   /* segment */
-        *((__u16 *) (frame + 0x467+2)) =  0;                            /* offset */
-        
-        /*
-         * Give back and unmap the borrowed frame.
-         */
-        map_page_to_frame(frame,0,PAGE_NOT_PRESENT,0);
-        frame_free(frame);
-
+        *((__u16 *) (PA2KA(0x467+0))) =  ((__address) ap_boot) >> 4;    /* segment */
+        *((__u16 *) (PA2KA(0x467+2))) =  0;                             /* offset */
+        
         /*
          * Save 0xa to address 0xf of the CMOS RAM.
@@ -472 +464 @@
 
                 memcopy(gdt, gdt_new, GDT_ITEMS*sizeof(struct descriptor));
+                memsetb(&gdt_new[TSS_DES], sizeof(struct descriptor), 0);
                 gdtr.base = KA2PA((__address) gdt_new);