tile: parameterize VA and PA space more cleanly

The existing code relied on the hardware definition (<arch/chip.h>)
to specify how much VA and PA space was available.  It's convenient
to allow customizing this for some configurations, so provide symbols
MAX_PA_WIDTH and MAX_VA_WIDTH in <asm/page.h> that can be modified
if desired.

Additionally, move away from the MEM_XX_INTRPT nomenclature to
define the start of various regions within the VA space.  In fact
the cleaner symbol is, for example, MEM_SV_START, to indicate the
start of the area used for supervisor code; the actual address of the
interrupt vectors is not as important, and can be changed if desired.
As part of this change, convert from "intrpt1" nomenclature (which
built in the old privilege-level 1 model) to a simple "intrpt".

Also strip out some tilepro-specific code supporting modifying the
PL the kernel could run at, since we don't actually support using
different PLs in tilepro, only tilegx.

Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>

1 files changed, 4 insertions, 4 deletions

diff --git a/arch/tile/kernel/setup.c b/arch/tile/kernel/setup.c
index 774e819f6a5f..10217844052a 100644
--- a/arch/tile/kernel/setup.c
+++ b/arch/tile/kernel/setup.c
@@ -268,7 +268,7 @@ early_param("vmalloc", parse_vmalloc);
 /*
  * Determine for each controller where its lowmem is mapped and how much of
  * it is mapped there.  On controller zero, the first few megabytes are
- * already mapped in as code at MEM_SV_INTRPT, so in principle we could
+ * already mapped in as code at MEM_SV_START, so in principle we could
  * start our data mappings higher up, but for now we don't bother, to avoid
  * additional confusion.
  *
@@ -1242,7 +1242,7 @@ static void __init validate_va(void)
 #ifndef __tilegx__   /* FIXME: GX: probably some validation relevant here */
 	/*
 	 * Similarly, make sure we're only using allowed VAs.
-	 * We assume we can contiguously use MEM_USER_INTRPT .. MEM_HV_INTRPT,
+	 * We assume we can contiguously use MEM_USER_INTRPT .. MEM_HV_START,
 	 * and 0 .. KERNEL_HIGH_VADDR.
 	 * In addition, make sure we CAN'T use the end of memory, since
 	 * we use the last chunk of each pgd for the pgd_list.
@@ -1257,7 +1257,7 @@ static void __init validate_va(void)
 		if (range.size == 0)
 			break;
 		if (range.start <= MEM_USER_INTRPT &&
-		    range.start + range.size >= MEM_HV_INTRPT)
+		    range.start + range.size >= MEM_HV_START)
 			user_kernel_ok = 1;
 		if (range.start == 0)
 			max_va = range.size;
@@ -1693,7 +1693,7 @@ insert_ram_resource(u64 start_pfn, u64 end_pfn, bool reserved)
 static int __init request_standard_resources(void)
 {
 	int i;
-	enum { CODE_DELTA = MEM_SV_INTRPT - PAGE_OFFSET };
+	enum { CODE_DELTA = MEM_SV_START - PAGE_OFFSET };
 
 #if defined(CONFIG_PCI) && !defined(__tilegx__)
 	insert_non_bus_resource();