[PATCH] pmm: Use 'struct segoff_s' in pmm header.

[Kevin O'Connor]

Minor cleanup - use 'struct segoff_s' instead of a manual
segment/offset pair.

Also, while at it, define the header signature at compile time instead
of at run-time.  (Defining at run-time is a hold over from when
variable changes were persistent across soft-reboots.)

Signed-off-by: Kevin O'Connor 
---
 src/pmm.c | 13 ++++---------
 1 file changed, 4 insertions(+), 9 deletions(-)

diff --git a/src/pmm.c b/src/pmm.c
index 653c9e2..1657c10 100644
--- a/src/pmm.c
+++ b/src/pmm.c
@@ -416,8 +416,7 @@ struct pmmheader {
     u8 version;
     u8 length;
     u8 checksum;
-    u16 entry_offset;
-    u16 entry_seg;
+    struct segoff_s entry;
     u8 reserved[5];
 } PACKED;

@@ -427,9 +426,9 @@ extern struct pmmheader PMMHEADER;

#if CONFIG_PMM
 struct pmmheader PMMHEADER __aligned(16) VAR16EXPORT = {
+    .signature = PMM_SIGNATURE,
     .version = 0x01,
     .length = sizeof(PMMHEADER),
-    .entry_seg = SEG_BIOS,
 };
 #endif

@@ -545,9 +544,6 @@ handle_pmm(u16 *args)
     return ret;
 }

-// romlayout.S
-extern void entry_pmm(void);
-
 void
 pmm_setup(void)
 {
@@ -556,8 +552,7 @@ pmm_setup(void)

dprintf(3, "init PMM\n");

-    PMMHEADER.signature = PMM_SIGNATURE;
-    PMMHEADER.entry_offset = (u32)entry_pmm - BUILD_BIOS_ADDR;
+    PMMHEADER.entry = FUNC16(entry_pmm);
     PMMHEADER.checksum -= checksum(&PMMHEADER, sizeof(PMMHEADER));
 }

@@ -570,5 +565,5 @@ pmm_finalize(void)
     dprintf(3, "finalize PMM\n");

PMMHEADER.signature = 0;
-    PMMHEADER.entry_offset = 0;
+    PMMHEADER.entry.segoff = 0;
 }