If you look at the 2.6.38 code for head.S, you may find the newer way it is
written to be a bit easier to read.
------------------------------------------------------------------------------
25 /* Physical address */
26 #define pa(X) ((X) - __PAGE_OFFSET)
...
345 /*
346 * Enable paging
347 */
348 movl $pa(initial_page_table), %eax
349 movl %eax,%cr3 /* set the page table pointer.. */
350 movl %cr0,%eax
351 orl $X86_CR0_PG,%eax
352 movl %eax,%cr0 /* ..and set paging (PG) bit */
353 ljmp $__BOOT_CS,$1f /* Clear prefetch and normalize %eip */
------------------------------------------------------------------------------
-James
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