CBMEM: Clarify CBMEM_TOP_BACKUP function usage

The deprecated LATE_CBMEM_INIT function is renamed:
  set_top_of_ram -> set_late_cbmem_top

Obscure term top_of_ram is replaced:
  backup_top_of_ram -> backup_top_of_low_cacheable
  get_top_of_ram -> restore_top_of_low_cacheable

New function that always resolves to CBMEM top boundary, with
or without SMM, is named restore_cbmem_top().

Change-Id: I61d20f94840ad61e9fd55976e5aa8c27040b8fb7
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/19377
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-by: Philippe Mathieu-Daudé <philippe.mathieu.daude@gmail.com>

7 files changed, 17 insertions, 21 deletions

diff --git a/src/southbridge/amd/agesa/hudson/ramtop.c b/src/southbridge/amd/agesa/hudson/ramtop.c
index 798a3bbf42..22b291d1bb 100644
--- a/src/southbridge/amd/agesa/hudson/ramtop.c
+++ b/src/southbridge/amd/agesa/hudson/ramtop.c
@@ -26,7 +26,7 @@ int acpi_get_sleep_type(void)
 	return (int)tmp;
 }
 
-void backup_top_of_ram(uint64_t ramtop)
+void backup_top_of_low_cacheable(uintptr_t ramtop)
 {
 	u32 dword = ramtop;
 	int nvram_pos = 0xf8, i; /* temp */
@@ -37,7 +37,7 @@ void backup_top_of_ram(uint64_t ramtop)
 	}
 }
 
-unsigned long get_top_of_ram(void)
+uintptr_t restore_top_of_low_cacheable(void)
 {
 	uint32_t xdata = 0;
 	int xnvram_pos = 0xf8, xi;
@@ -47,5 +47,5 @@ unsigned long get_top_of_ram(void)
 		xdata |= inb(BIOSRAM_DATA) << (xi *8);
 		xnvram_pos++;
 	}
-	return (unsigned long) xdata;
+	return xdata;
 }
diff --git a/src/southbridge/amd/cimx/sb700/ramtop.c b/src/southbridge/amd/cimx/sb700/ramtop.c
index f59a9a346b..cbc4596f57 100644
--- a/src/southbridge/amd/cimx/sb700/ramtop.c
+++ b/src/southbridge/amd/cimx/sb700/ramtop.c
@@ -18,7 +18,7 @@
 #include <cbmem.h>
 #include <southbridge/amd/cimx/cimx_util.h>
 
-void backup_top_of_ram(uint64_t ramtop)
+void backup_top_of_low_cacheable(uintptr_t ramtop)
 {
 	u32 dword = ramtop;
 	int nvram_pos = 0xfc, i;
@@ -29,7 +29,7 @@ void backup_top_of_ram(uint64_t ramtop)
 	}
 }
 
-unsigned long get_top_of_ram(void)
+uintptr_t restore_top_of_low_cacheable(void)
 {
 	u32 xdata = 0;
 	int xnvram_pos = 0xfc, xi;
@@ -39,5 +39,5 @@ unsigned long get_top_of_ram(void)
 		xdata |= inb(BIOSRAM_DATA) << (xi *8);
 		xnvram_pos++;
 	}
-	return (unsigned long) xdata;
+	return xdata;
 }
diff --git a/src/southbridge/amd/cimx/sb800/ramtop.c b/src/southbridge/amd/cimx/sb800/ramtop.c
index 4d5b9a8a62..3c685767bc 100644
--- a/src/southbridge/amd/cimx/sb800/ramtop.c
+++ b/src/southbridge/amd/cimx/sb800/ramtop.c
@@ -26,7 +26,7 @@ int acpi_get_sleep_type(void)
 	return (int)tmp;
 }
 
-void backup_top_of_ram(uint64_t ramtop)
+void backup_top_of_low_cacheable(uintptr_t ramtop)
 {
 	u32 dword = ramtop;
 	int nvram_pos = 0xf8, i; /* temp */
@@ -37,7 +37,7 @@ void backup_top_of_ram(uint64_t ramtop)
 	}
 }
 
-unsigned long get_top_of_ram(void)
+uintptr_t restore_top_of_low_cacheable(void)
 {
 	u32 xdata = 0;
 	int xnvram_pos = 0xf8, xi;
@@ -47,5 +47,5 @@ unsigned long get_top_of_ram(void)
 		xdata |= inb(BIOSRAM_DATA) << (xi *8);
 		xnvram_pos++;
 	}
-	return (unsigned long) xdata;
+	return xdata;
 }
diff --git a/src/southbridge/amd/cimx/sb900/ramtop.c b/src/southbridge/amd/cimx/sb900/ramtop.c
index 34e8364379..26e930bb7e 100644
--- a/src/southbridge/amd/cimx/sb900/ramtop.c
+++ b/src/southbridge/amd/cimx/sb900/ramtop.c
@@ -18,7 +18,7 @@
 #include <cbmem.h>
 #include <southbridge/amd/cimx/cimx_util.h>
 
-void backup_top_of_ram(uint64_t ramtop)
+void backup_top_of_low_cacheable(uintptr_t ramtop)
 {
 	u32 dword = ramtop;
 	int nvram_pos = 0xf8, i; /* temp */
@@ -29,7 +29,7 @@ void backup_top_of_ram(uint64_t ramtop)
 	}
 }
 
-unsigned long get_top_of_ram(void)
+uintptr_t restore_top_of_low_cacheable(void)
 {
 	u32 xdata = 0;
 	int xnvram_pos = 0xf8, xi;
@@ -39,5 +39,5 @@ unsigned long get_top_of_ram(void)
 		xdata |= inb(BIOSRAM_DATA) << (xi *8);
 		xnvram_pos++;
 	}
-	return (unsigned long) xdata;
+	return xdata;
 }
diff --git a/src/southbridge/amd/sb700/early_setup.c b/src/southbridge/amd/sb700/early_setup.c
index f20c1e1dfd..3ed4cac8a1 100644
--- a/src/southbridge/amd/sb700/early_setup.c
+++ b/src/southbridge/amd/sb700/early_setup.c
@@ -860,8 +860,7 @@ void set_lpc_sticky_ctl(bool enable)
 	pmio_write(0xbb, byte);
 }
 
-#if IS_ENABLED(CONFIG_LATE_CBMEM_INIT)
-unsigned long get_top_of_ram(void)
+uintptr_t restore_top_of_low_cacheable(void)
 {
 	uint32_t xdata = 0;
 	int xnvram_pos = 0xfc, xi;
@@ -873,8 +872,7 @@ unsigned long get_top_of_ram(void)
 		xdata |= inb(BIOSRAM_DATA) << (xi *8);
 		xnvram_pos++;
 	}
-	return (unsigned long) xdata;
+	return xdata;
 }
-#endif
 
 #endif
diff --git a/src/southbridge/amd/sb700/lpc.c b/src/southbridge/amd/sb700/lpc.c
index 8270f8a450..fda30b8687 100644
--- a/src/southbridge/amd/sb700/lpc.c
+++ b/src/southbridge/amd/sb700/lpc.c
@@ -89,7 +89,7 @@ int acpi_get_sleep_type(void)
 	return ((tmp & (7 << 10)) >> 10);
 }
 
-void backup_top_of_ram(uint64_t ramtop)
+void backup_top_of_low_cacheable(uintptr_t ramtop)
 {
 	u32 dword = (u32) ramtop;
 	int nvram_pos = 0xfc, i;
diff --git a/src/southbridge/amd/sb800/early_setup.c b/src/southbridge/amd/sb800/early_setup.c
index 7ac6ec85fe..c9ae08c755 100644
--- a/src/southbridge/amd/sb800/early_setup.c
+++ b/src/southbridge/amd/sb800/early_setup.c
@@ -665,8 +665,7 @@ int acpi_get_sleep_type(void)
 	return ((tmp & (7 << 10)) >> 10);
 }
 
-#if IS_ENABLED(CONFIG_LATE_CBMEM_INIT)
-unsigned long get_top_of_ram(void)
+uintptr_t restore_top_of_low_cacheable(void)
 {
 	uint32_t xdata = 0;
 	int xnvram_pos = 0xfc, xi;
@@ -678,8 +677,7 @@ unsigned long get_top_of_ram(void)
 		xdata |= inb(BIOSRAM_DATA) << (xi *8);
 		xnvram_pos++;
 	}
-	return (unsigned long) xdata;
+	return xdata;
 }
-#endif
 
 #endif