linux 2.6.16.38 w/ vs2.0.3-rc1

[linux-2.6.git] / arch / parisc / kernel / firmware.c

diff --git a/arch/parisc/kernel/firmware.c b/arch/parisc/kernel/firmware.c
index f244fb2..01768a6 100644 (file)
--- a/arch/parisc/kernel/firmware.c
+++ b/arch/parisc/kernel/firmware.c
@@ -80,18 +80,18 @@ static unsigned long pdc_result2[32] __attribute__ ((aligned (8)));
 
 /* Firmware needs to be initially set to narrow to determine the 
  * actual firmware width. */
-int parisc_narrow_firmware = 1;
+int parisc_narrow_firmware __read_mostly = 1;
 #endif
 
-/* on all currently-supported platforms, IODC I/O calls are always
- * 32-bit calls, and MEM_PDC calls are always the same width as the OS.
- * This means Cxxx boxes can't run wide kernels right now. -PB
+/* On most currently-supported platforms, IODC I/O calls are 32-bit calls
+ * and MEM_PDC calls are always the same width as the OS.
+ * Some PAT boxes may have 64-bit IODC I/O.
  *
- * CONFIG_PDC_NARROW has been added to allow 64-bit kernels to run on
- * systems with 32-bit MEM_PDC calls. This will allow wide kernels to
- * run on Cxxx boxes now. -RB
- *
- * Note that some PAT boxes may have 64-bit IODC I/O...
+ * Ryan Bradetich added the now obsolete CONFIG_PDC_NARROW to allow
+ * 64-bit kernels to run on systems with 32-bit MEM_PDC calls.
+ * This allowed wide kernels to run on Cxxx boxes.
+ * We now detect 32-bit-only PDC and dynamically switch to 32-bit mode
+ * when running a 64-bit kernel on such boxes (e.g. C200 or C360).
  */
 
 #ifdef __LP64__
@@ -1013,7 +1013,7 @@ void pdc_iodc_putc(unsigned char c)
         static int __attribute__((aligned(8)))   iodc_retbuf[32];
         static char __attribute__((aligned(64))) iodc_dbuf[4096];
         unsigned int n;
-       unsigned int flags;
+       unsigned long flags;
 
         switch (c) {
         case '\n':
@@ -1052,7 +1052,8 @@ void pdc_iodc_putc(unsigned char c)
  */
 void pdc_iodc_outc(unsigned char c)
 {
-       unsigned int n, flags;
+       unsigned int n;
+       unsigned long flags;
 
        /* fill buffer with one caracter and print it */
         static int __attribute__((aligned(8)))   iodc_retbuf[32];
@@ -1077,7 +1078,7 @@ void pdc_iodc_outc(unsigned char c)
  */
 int pdc_iodc_getc(void)
 {
-       unsigned int flags;
+       unsigned long flags;
         static int __attribute__((aligned(8)))   iodc_retbuf[32];
         static char __attribute__((aligned(64))) iodc_dbuf[4096];
        int ch;