[SeaBIOS] [PATCH v3] csm: Fix boot priority translation

David Woodhouse posted 1 patch 15 weeks ago
Patches applied successfully (tree, apply log)
git fetch https://github.com/patchew-project/seabios tags/patchew/35aef2e1020737b40edfd44d9d65ceca012641a9.camel@infradead.org
src/fw/csm.c | 23 ++++++++++++++++++++---
1 file changed, 20 insertions(+), 3 deletions(-)

[SeaBIOS] [PATCH v3] csm: Fix boot priority translation

Posted by David Woodhouse 15 weeks ago
Explicitly handle the BBS_DO_NOT_BOOT_FROM and BBS_IGNORE_ENTRY values.

Also add one to the other priority values, as find_prio() does for
entries from bootorder. SeaBIOS uses zero for an item explicitly
selected in interactive_bootmenu().

Signed-off-by: David Woodhouse <dwmw2@infradead.org>
---
v2: No code change, just correct the commit message.
v3: Add comment in code as requested by agraf, update commit message more.

src/fw/csm.c | 23 ++++++++++++++++++++---
 1 file changed, 20 insertions(+), 3 deletions(-)

diff --git a/src/fw/csm.c b/src/fw/csm.c
index 3fcc252..8359bcb 100644
--- a/src/fw/csm.c
+++ b/src/fw/csm.c
@@ -319,6 +319,23 @@ handle_csm(struct bregs *regs)
     csm_return(regs);
 }
 
+static int csm_prio_to_seabios(u16 csm_prio)
+{
+    switch (csm_prio) {
+    case BBS_DO_NOT_BOOT_FROM:
+    case BBS_IGNORE_ENTRY:
+        return -1;
+
+    case BBS_LOWEST_PRIORITY:
+    case BBS_UNPRIORITIZED_ENTRY:
+    default:
+        // SeaBIOS default priorities start at 1, with 0 being used for
+        // an item explicitly selected from interactive_bootmenu().
+        // As in find_prio(), add 1 to the value being returned.
+        return csm_prio + 1;
+    }
+}
+
 int csm_bootprio_ata(struct pci_device *pci, int chanid, int slave)
 {
     if (!csm_boot_table)
@@ -327,7 +344,7 @@ int csm_bootprio_ata(struct pci_device *pci, int chanid, int slave)
     int index = 1 + (chanid * 2) + slave;
     dprintf(3, "CSM bootprio for ATA%d,%d (index %d) is %d\n", chanid, slave,
             index, bbs[index].BootPriority);
-    return bbs[index].BootPriority;
+    return csm_prio_to_seabios(bbs[index].BootPriority);
 }
 
 int csm_bootprio_fdc(struct pci_device *pci, int port, int fdid)
@@ -336,7 +353,7 @@ int csm_bootprio_fdc(struct pci_device *pci, int port, int fdid)
         return -1;
     BBS_TABLE *bbs = (void *)csm_boot_table->BbsTable;
     dprintf(3, "CSM bootprio for FDC is %d\n", bbs[0].BootPriority);
-    return bbs[0].BootPriority;
+    return csm_prio_to_seabios(bbs[0].BootPriority);
 }
 
 int csm_bootprio_pci(struct pci_device *pci)
@@ -350,7 +367,7 @@ int csm_bootprio_pci(struct pci_device *pci)
         if (pci->bdf == pci_to_bdf(bbs[i].Bus, bbs[i].Device, bbs[i].Function)) {
             dprintf(3, "CSM bootprio for PCI(%d,%d,%d) is %d\n", bbs[i].Bus,
                     bbs[i].Device, bbs[i].Function, bbs[i].BootPriority);
-            return bbs[i].BootPriority;
+            return csm_prio_to_seabios(bbs[i].BootPriority);
         }
     }
     return -1;

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[SeaBIOS] Re: [PATCH v3] csm: Fix boot priority translation

Posted by Kevin O'Connor 15 weeks ago
On Fri, Jun 28, 2019 at 02:57:47PM +0100, David Woodhouse wrote:
> Explicitly handle the BBS_DO_NOT_BOOT_FROM and BBS_IGNORE_ENTRY values.
> 
> Also add one to the other priority values, as find_prio() does for
> entries from bootorder. SeaBIOS uses zero for an item explicitly
> selected in interactive_bootmenu().

Thanks, I committed this change.

-Kevin
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