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arch/tile: parameterize system PLs to support KVM port

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While not a port to KVM (yet), this change modifies the kernel
to be able to build either at PL1 or at PL2 with a suitable
config switch.  Pushing up this change avoids handling branch
merge issues going forward with the KVM work.

Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
This commit is contained in:
Chris Metcalf
2010-10-14 16:23:03 -04:00
parent bf65e440e8
commit a78c942df6
23 changed files with 337 additions and 131 deletions
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27
arch/tile/include/asm/page.h
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@ -199,17 +199,17 @@ static inline __attribute_const__ int get_order(unsigned long size)
* If you want more physical memory than this then see the CONFIG_HIGHMEM
* option in the kernel configuration.
*
* The top two 16MB chunks in the table below (VIRT and HV) are
* unavailable to Linux. Since the kernel interrupt vectors must live
* at 0xfd000000, we map all of the bottom of RAM at this address with
* a huge page table entry to minimize its ITLB footprint (as well as
* at PAGE_OFFSET). The last architected requirement is that user
* interrupt vectors live at 0xfc000000, so we make that range of
* memory available to user processes. The remaining regions are sized
* as shown; after the first four addresses, we show "typical" values,
* since the actual addresses depend on kernel #defines.
* The top 16MB chunk in the table below is unavailable to Linux. Since
* the kernel interrupt vectors must live at ether 0xfe000000 or 0xfd000000
* (depending on whether the kernel is at PL2 or Pl1), we map all of the
* bottom of RAM at this address with a huge page table entry to minimize
* its ITLB footprint (as well as at PAGE_OFFSET). The last architected
* requirement is that user interrupt vectors live at 0xfc000000, so we
* make that range of memory available to user processes. The remaining
* regions are sized as shown; the first four addresses use the PL 1
* values, and after that, we show "typical" values, since the actual
* addresses depend on kernel #defines.
*
* MEM_VIRT_INTRPT 0xff000000
* MEM_HV_INTRPT 0xfe000000
* MEM_SV_INTRPT (kernel code) 0xfd000000
* MEM_USER_INTRPT (user vector) 0xfc000000
@ -221,9 +221,14 @@ static inline __attribute_const__ int get_order(unsigned long size)
*/
#define MEM_USER_INTRPT _AC(0xfc000000, UL)
#if CONFIG_KERNEL_PL == 1
#define MEM_SV_INTRPT _AC(0xfd000000, UL)
#define MEM_HV_INTRPT _AC(0xfe000000, UL)
#define MEM_VIRT_INTRPT _AC(0xff000000, UL)
#else
#define MEM_GUEST_INTRPT _AC(0xfd000000, UL)
#define MEM_SV_INTRPT _AC(0xfe000000, UL)
#define MEM_HV_INTRPT _AC(0xff000000, UL)
#endif
#define INTRPT_SIZE 0x4000