From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Eric Snowberg <eric.snowberg@oracle.com>
Date: Mon, 26 Feb 2018 17:34:14 -0800
Subject: [PATCH] ieee1275: decode-unit command for 4 addr cell devs

decode-unit ( addr len -- phys.lo ... phys.hi )

Convert text unit-string to physical address.

Convert unit-string, the text string representation, to phys.lo ... phys.hi,
the numerical representation of a physical address within the address space
defined by this device node. The number of cells in the list
phys.lo ... phys.hi is determined by the value of the #address-cells
property of this node.

This function is for devices with #address-cells == 4

Signed-off-by: Eric Snowberg <eric.snowberg@oracle.com>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
---
 grub-core/kern/ieee1275/ieee1275.c | 41 ++++++++++++++++++++++++++++++++++++++
 include/grub/ieee1275/ieee1275.h   |  7 ++++++-
 2 files changed, 47 insertions(+), 1 deletion(-)

diff --git a/grub-core/kern/ieee1275/ieee1275.c b/grub-core/kern/ieee1275/ieee1275.c
index 98217029f45..b0ac6f9f9a8 100644
--- a/grub-core/kern/ieee1275/ieee1275.c
+++ b/grub-core/kern/ieee1275/ieee1275.c
@@ -482,6 +482,47 @@ grub_ieee1275_close (grub_ieee1275_ihandle_t ihandle)
   return 0;
 }
 
+int
+grub_ieee1275_decode_unit4 (grub_ieee1275_ihandle_t ihandle,
+                            void *addr, grub_size_t size,
+                            grub_uint32_t *phy_lo, grub_uint32_t *phy_hi,
+                            grub_uint32_t *lun_lo, grub_uint32_t *lun_hi)
+{
+  struct decode_args
+  {
+    struct grub_ieee1275_common_hdr common;
+    grub_ieee1275_cell_t method;
+    grub_ieee1275_cell_t ihandle;
+    grub_ieee1275_cell_t size;
+    grub_ieee1275_cell_t addr;
+    grub_ieee1275_cell_t catch_result;
+    grub_ieee1275_cell_t tgt_h;
+    grub_ieee1275_cell_t tgt_l;
+    grub_ieee1275_cell_t lun_h;
+    grub_ieee1275_cell_t lun_l;
+  }
+  args;
+
+  INIT_IEEE1275_COMMON (&args.common, "call-method", 4, 5);
+  args.method = (grub_ieee1275_cell_t) "decode-unit";
+  args.ihandle = ihandle;
+  args.size = size;
+  args.addr = (grub_ieee1275_cell_t) addr;
+  args.catch_result = 1;
+
+  if ((IEEE1275_CALL_ENTRY_FN (&args) == -1) || (args.catch_result))
+    {
+      grub_error (GRUB_ERR_OUT_OF_RANGE, "decode-unit failed\n");
+      return -1;
+    }
+
+  *phy_lo = args.tgt_l;
+  *phy_hi = args.tgt_h;
+  *lun_lo = args.lun_l;
+  *lun_hi = args.lun_h;
+  return 0;
+}
+
 int
 grub_ieee1275_claim (grub_addr_t addr, grub_size_t size, unsigned int align,
 		     grub_addr_t *result)
diff --git a/include/grub/ieee1275/ieee1275.h b/include/grub/ieee1275/ieee1275.h
index 8e425130327..534406458b2 100644
--- a/include/grub/ieee1275/ieee1275.h
+++ b/include/grub/ieee1275/ieee1275.h
@@ -210,7 +210,12 @@ int EXPORT_FUNC(grub_ieee1275_set_property) (grub_ieee1275_phandle_t phandle,
 int EXPORT_FUNC(grub_ieee1275_set_color) (grub_ieee1275_ihandle_t ihandle,
 					  int index, int r, int g, int b);
 int EXPORT_FUNC(grub_ieee1275_milliseconds) (grub_uint32_t *msecs);
-
+int EXPORT_FUNC(grub_ieee1275_decode_unit4) (grub_ieee1275_ihandle_t ihandle,
+                                             void *addr, grub_size_t size,
+                                             grub_uint32_t *phy_lo,
+                                             grub_uint32_t *phy_hi,
+                                             grub_uint32_t *lun_lo,
+                                             grub_uint32_t *lun_hi);
 
 grub_err_t EXPORT_FUNC(grub_claimmap) (grub_addr_t addr, grub_size_t size);