Blackfin arch: Extend sram malloc to handle L2 SRAM.

Extend system call to alloc L2 SRAM in application.
Automatically move following sections to L2 SRAM:
1. kernel built-in l2 attribute section
2. kernel module l2 attribute section
3. elf-fdpic application l2 attribute section

Signed-off-by: Sonic Zhang <sonic.zhang@analog.com>
Signed-off-by: Bryan Wu <cooloney@kernel.org>

4 files changed, 241 insertions, 53 deletions

diff --git a/arch/blackfin/kernel/module.c b/arch/blackfin/kernel/module.c
index 14a42848f37f..e1bebc80a5bf 100644
--- a/arch/blackfin/kernel/module.c
+++ b/arch/blackfin/kernel/module.c
@@ -173,7 +173,7 @@ module_frob_arch_sections(Elf_Ehdr * hdr, Elf_Shdr * sechdrs,
 	for (s = sechdrs; s < sechdrs_end; ++s) {
 		if ((strcmp(".l1.text", secstrings + s->sh_name) == 0) ||
 		    ((strcmp(".text", secstrings + s->sh_name) == 0) &&
-		     (hdr->e_flags & FLG_CODE_IN_L1) && (s->sh_size > 0))) {
+		     (hdr->e_flags & EF_BFIN_CODE_IN_L1) && (s->sh_size > 0))) {
 			dest = l1_inst_sram_alloc(s->sh_size);
 			mod->arch.text_l1 = dest;
 			if (dest == NULL) {
@@ -188,7 +188,7 @@ module_frob_arch_sections(Elf_Ehdr * hdr, Elf_Shdr * sechdrs,
 		}
 		if ((strcmp(".l1.data", secstrings + s->sh_name) == 0) ||
 		    ((strcmp(".data", secstrings + s->sh_name) == 0) &&
-		     (hdr->e_flags & FLG_DATA_IN_L1) && (s->sh_size > 0))) {
+		     (hdr->e_flags & EF_BFIN_DATA_IN_L1) && (s->sh_size > 0))) {
 			dest = l1_data_sram_alloc(s->sh_size);
 			mod->arch.data_a_l1 = dest;
 			if (dest == NULL) {
@@ -203,7 +203,7 @@ module_frob_arch_sections(Elf_Ehdr * hdr, Elf_Shdr * sechdrs,
 		}
 		if (strcmp(".l1.bss", secstrings + s->sh_name) == 0 ||
 		    ((strcmp(".bss", secstrings + s->sh_name) == 0) &&
-		     (hdr->e_flags & FLG_DATA_IN_L1) && (s->sh_size > 0))) {
+		     (hdr->e_flags & EF_BFIN_DATA_IN_L1) && (s->sh_size > 0))) {
 			dest = l1_data_sram_alloc(s->sh_size);
 			mod->arch.bss_a_l1 = dest;
 			if (dest == NULL) {
@@ -242,6 +242,51 @@ module_frob_arch_sections(Elf_Ehdr * hdr, Elf_Shdr * sechdrs,
 			s->sh_flags &= ~SHF_ALLOC;
 			s->sh_addr = (unsigned long)dest;
 		}
+		if ((strcmp(".l2.text", secstrings + s->sh_name) == 0) ||
+		    ((strcmp(".text", secstrings + s->sh_name) == 0) &&
+		     (hdr->e_flags & EF_BFIN_CODE_IN_L2) && (s->sh_size > 0))) {
+			dest = l2_sram_alloc(s->sh_size);
+			mod->arch.text_l2 = dest;
+			if (dest == NULL) {
+				printk(KERN_ERR
+				       "module %s: L2 SRAM allocation failed\n",
+				       mod->name);
+				return -1;
+			}
+			memcpy(dest, (void *)s->sh_addr, s->sh_size);
+			s->sh_flags &= ~SHF_ALLOC;
+			s->sh_addr = (unsigned long)dest;
+		}
+		if ((strcmp(".l2.data", secstrings + s->sh_name) == 0) ||
+		    ((strcmp(".data", secstrings + s->sh_name) == 0) &&
+		     (hdr->e_flags & EF_BFIN_DATA_IN_L2) && (s->sh_size > 0))) {
+			dest = l2_sram_alloc(s->sh_size);
+			mod->arch.data_l2 = dest;
+			if (dest == NULL) {
+				printk(KERN_ERR
+					"module %s: L2 SRAM allocation failed\n",
+					mod->name);
+				return -1;
+			}
+			memcpy(dest, (void *)s->sh_addr, s->sh_size);
+			s->sh_flags &= ~SHF_ALLOC;
+			s->sh_addr = (unsigned long)dest;
+		}
+		if (strcmp(".l2.bss", secstrings + s->sh_name) == 0 ||
+		    ((strcmp(".bss", secstrings + s->sh_name) == 0) &&
+		     (hdr->e_flags & EF_BFIN_DATA_IN_L2) && (s->sh_size > 0))) {
+			dest = l2_sram_alloc(s->sh_size);
+			mod->arch.bss_l2 = dest;
+			if (dest == NULL) {
+				printk(KERN_ERR
+					"module %s: L2 SRAM allocation failed\n",
+					mod->name);
+				return -1;
+			}
+			memset(dest, 0, s->sh_size);
+			s->sh_flags &= ~SHF_ALLOC;
+			s->sh_addr = (unsigned long)dest;
+		}
 	}
 	return 0;
 }
@@ -411,9 +456,10 @@ module_finalize(const Elf_Ehdr * hdr,
 			continue;
 
 		if ((sechdrs[i].sh_type == SHT_RELA) &&
-		    ((strcmp(".rela.l1.text", secstrings + sechdrs[i].sh_name) == 0) ||
+		    ((strcmp(".rela.l2.text", secstrings + sechdrs[i].sh_name) == 0) ||
+		    (strcmp(".rela.l1.text", secstrings + sechdrs[i].sh_name) == 0) ||
 		    ((strcmp(".rela.text", secstrings + sechdrs[i].sh_name) == 0) &&
-			 (hdr->e_flags & FLG_CODE_IN_L1)))) {
+			(hdr->e_flags & (EF_BFIN_CODE_IN_L1|EF_BFIN_CODE_IN_L2))))) {
 			apply_relocate_add((Elf_Shdr *) sechdrs, strtab,
 					   symindex, i, mod);
 		}
@@ -423,14 +469,12 @@ module_finalize(const Elf_Ehdr * hdr,
 
 void module_arch_cleanup(struct module *mod)
 {
-	if (mod->arch.text_l1)
-		l1_inst_sram_free((void *)mod->arch.text_l1);
-	if (mod->arch.data_a_l1)
-		l1_data_sram_free((void *)mod->arch.data_a_l1);
-	if (mod->arch.bss_a_l1)
-		l1_data_sram_free((void *)mod->arch.bss_a_l1);
-	if (mod->arch.data_b_l1)
-		l1_data_B_sram_free((void *)mod->arch.data_b_l1);
-	if (mod->arch.bss_b_l1)
-		l1_data_B_sram_free((void *)mod->arch.bss_b_l1);
+	l1_inst_sram_free(mod->arch.text_l1);
+	l1_data_A_sram_free(mod->arch.data_a_l1);
+	l1_data_A_sram_free(mod->arch.bss_a_l1);
+	l1_data_B_sram_free(mod->arch.data_b_l1);
+	l1_data_B_sram_free(mod->arch.bss_b_l1);
+	l2_sram_free(mod->arch.text_l2);
+	l2_sram_free(mod->arch.data_l2);
+	l2_sram_free(mod->arch.bss_l2);
 }
diff --git a/arch/blackfin/kernel/setup.c b/arch/blackfin/kernel/setup.c
index 861a1db74df8..8671d1db1f99 100644
--- a/arch/blackfin/kernel/setup.c
+++ b/arch/blackfin/kernel/setup.c
@@ -104,6 +104,7 @@ void __init bf53x_relocate_l1_mem(void)
 	unsigned long l1_code_length;
 	unsigned long l1_data_a_length;
 	unsigned long l1_data_b_length;
+	unsigned long l2_length;
 
 	l1_code_length = _etext_l1 - _stext_l1;
 	if (l1_code_length > L1_CODE_LENGTH)
@@ -129,6 +130,15 @@ void __init bf53x_relocate_l1_mem(void)
 	/* Copy _sdata_b_l1 to _ebss_b_l1 to L1 data bank B SRAM */
 	dma_memcpy(_sdata_b_l1, _l1_lma_start + l1_code_length +
 			l1_data_a_length, l1_data_b_length);
+
+#ifdef L2_LENGTH
+	l2_length = _ebss_l2 - _stext_l2;
+	if (l2_length > L2_LENGTH)
+		panic("L2 SRAM Overflow\n");
+
+	/* Copy _stext_l2 to _edata_l2 to L2 SRAM */
+	dma_memcpy(_stext_l2, _l2_lma_start, l2_length);
+#endif
 }
 
 /* add_memory_region to memmap */
diff --git a/arch/blackfin/kernel/vmlinux.lds.S b/arch/blackfin/kernel/vmlinux.lds.S
index 3ecc64cab3be..0896e38d6108 100644
--- a/arch/blackfin/kernel/vmlinux.lds.S
+++ b/arch/blackfin/kernel/vmlinux.lds.S
@@ -101,6 +101,11 @@ SECTIONS
 #if !L1_DATA_B_LENGTH
 		*(.l1.data.B)
 #endif
+#ifndef L2_LENGTH
+		. = ALIGN(32);
+		*(.data_l2.cacheline_aligned)
+		*(.l2.data)
+#endif
 
 		DATA_DATA
 		*(.data.*)
@@ -182,14 +187,13 @@ SECTIONS
 		*(.l1.data)
 		__edata_l1 = .;
 
-		. = ALIGN(4);
-		__sbss_l1 = .;
-		*(.l1.bss)
-
 		. = ALIGN(32);
 		*(.data_l1.cacheline_aligned)
 
 		. = ALIGN(4);
+		__sbss_l1 = .;
+		*(.l1.bss)
+		. = ALIGN(4);
 		__ebss_l1 = .;
 	}
 
@@ -203,11 +207,37 @@ SECTIONS
 		. = ALIGN(4);
 		__sbss_b_l1 = .;
 		*(.l1.bss.B)
-
 		. = ALIGN(4);
 		__ebss_b_l1 = .;
 	}
 
+#ifdef L2_LENGTH
+	__l2_lma_start = .;
+
+	.text_data_l2 L2_START : AT(LOADADDR(.data_b_l1) + SIZEOF(.data_b_l1))
+	{
+		. = ALIGN(4);
+		__stext_l2 = .;
+		*(.l1.text)
+		. = ALIGN(4);
+		__etext_l2 = .;
+
+		. = ALIGN(4);
+		__sdata_l2 = .;
+		*(.l1.data)
+		__edata_l2 = .;
+
+		. = ALIGN(32);
+		*(.data_l2.cacheline_aligned)
+
+		. = ALIGN(4);
+		__sbss_l2 = .;
+		*(.l1.bss)
+		. = ALIGN(4);
+		__ebss_l2 = .;
+	}
+#endif
+
 	/* Force trailing alignment of our init section so that when we
 	 * free our init memory, we don't leave behind a partial page.
 	 */
diff --git a/arch/blackfin/mm/blackfin_sram.c b/arch/blackfin/mm/blackfin_sram.c
index b58cf196d7cc..5af3c31c9365 100644
--- a/arch/blackfin/mm/blackfin_sram.c
+++ b/arch/blackfin/mm/blackfin_sram.c
@@ -42,6 +42,7 @@
 #include "blackfin_sram.h"
 
 static spinlock_t l1sram_lock, l1_data_sram_lock, l1_inst_sram_lock;
+static spinlock_t l2_sram_lock;
 
 /* the data structure for L1 scratchpad and DATA SRAM */
 struct sram_piece {
@@ -65,6 +66,10 @@ static struct sram_piece free_l1_data_B_sram_head, used_l1_data_B_sram_head;
 static struct sram_piece free_l1_inst_sram_head, used_l1_inst_sram_head;
 #endif
 
+#ifdef L2_LENGTH
+static struct sram_piece free_l2_sram_head, used_l2_sram_head;
+#endif
+
 static struct kmem_cache *sram_piece_cache;
 
 /* L1 Scratchpad SRAM initialization function */
@@ -97,7 +102,7 @@ static void __init l1_data_sram_init(void)
 	free_l1_data_A_sram_head.next =
 		kmem_cache_alloc(sram_piece_cache, GFP_KERNEL);
 	if (!free_l1_data_A_sram_head.next) {
-		printk(KERN_INFO"Fail to initialize Data A SRAM.\n");
+		printk(KERN_INFO"Fail to initialize L1 Data A SRAM.\n");
 		return;
 	}
 
@@ -110,7 +115,7 @@ static void __init l1_data_sram_init(void)
 
 	used_l1_data_A_sram_head.next = NULL;
 
-	printk(KERN_INFO "Blackfin Data A SRAM: %d KB (%d KB free)\n",
+	printk(KERN_INFO "Blackfin L1 Data A SRAM: %d KB (%d KB free)\n",
 		L1_DATA_A_LENGTH >> 10,
 		free_l1_data_A_sram_head.next->size >> 10);
 #endif
@@ -118,7 +123,7 @@ static void __init l1_data_sram_init(void)
 	free_l1_data_B_sram_head.next =
 		kmem_cache_alloc(sram_piece_cache, GFP_KERNEL);
 	if (!free_l1_data_B_sram_head.next) {
-		printk(KERN_INFO"Fail to initialize Data B SRAM.\n");
+		printk(KERN_INFO"Fail to initialize L1 Data B SRAM.\n");
 		return;
 	}
 
@@ -131,7 +136,7 @@ static void __init l1_data_sram_init(void)
 
 	used_l1_data_B_sram_head.next = NULL;
 
-	printk(KERN_INFO "Blackfin Data B SRAM: %d KB (%d KB free)\n",
+	printk(KERN_INFO "Blackfin L1 Data B SRAM: %d KB (%d KB free)\n",
 		L1_DATA_B_LENGTH >> 10,
 		free_l1_data_B_sram_head.next->size >> 10);
 #endif
@@ -146,7 +151,7 @@ static void __init l1_inst_sram_init(void)
 	free_l1_inst_sram_head.next =
 		kmem_cache_alloc(sram_piece_cache, GFP_KERNEL);
 	if (!free_l1_inst_sram_head.next) {
-		printk(KERN_INFO"Fail to initialize Instruction SRAM.\n");
+		printk(KERN_INFO"Fail to initialize L1 Instruction SRAM.\n");
 		return;
 	}
 
@@ -159,7 +164,7 @@ static void __init l1_inst_sram_init(void)
 
 	used_l1_inst_sram_head.next = NULL;
 
-	printk(KERN_INFO "Blackfin Instruction SRAM: %d KB (%d KB free)\n",
+	printk(KERN_INFO "Blackfin L1 Instruction SRAM: %d KB (%d KB free)\n",
 		L1_CODE_LENGTH >> 10,
 		free_l1_inst_sram_head.next->size >> 10);
 #endif
@@ -168,6 +173,33 @@ static void __init l1_inst_sram_init(void)
 	spin_lock_init(&l1_inst_sram_lock);
 }
 
+static void __init l2_sram_init(void)
+{
+#ifdef L2_LENGTH
+	free_l2_sram_head.next =
+		kmem_cache_alloc(sram_piece_cache, GFP_KERNEL);
+	if (!free_l2_sram_head.next) {
+		printk(KERN_INFO"Fail to initialize L2 SRAM.\n");
+		return;
+	}
+
+	free_l2_sram_head.next->paddr = (void *)L2_START +
+		(_etext_l2 - _stext_l2) + (_edata_l2 - _sdata_l2);
+	free_l2_sram_head.next->size = L2_LENGTH -
+		(_etext_l2 - _stext_l2) + (_edata_l2 - _sdata_l2);
+	free_l2_sram_head.next->pid = 0;
+	free_l2_sram_head.next->next = NULL;
+
+	used_l2_sram_head.next = NULL;
+
+	printk(KERN_INFO "Blackfin L2 SRAM: %d KB (%d KB free)\n",
+		L2_LENGTH >> 10,
+		free_l2_sram_head.next->size >> 10);
+#endif
+
+	/* mutex initialize */
+	spin_lock_init(&l2_sram_lock);
+}
 void __init bfin_sram_init(void)
 {
 	sram_piece_cache = kmem_cache_create("sram_piece_cache",
@@ -177,10 +209,11 @@ void __init bfin_sram_init(void)
 	l1sram_init();
 	l1_data_sram_init();
 	l1_inst_sram_init();
+	l2_sram_init();
 }
 
-/* L1 memory allocate function */
-static void *_l1_sram_alloc(size_t size, struct sram_piece *pfree_head,
+/* SRAM allocate function */
+static void *_sram_alloc(size_t size, struct sram_piece *pfree_head,
 		struct sram_piece *pused_head)
 {
 	struct sram_piece *pslot, *plast, *pavail;
@@ -236,7 +269,7 @@ static void *_l1_sram_alloc(size_t size, struct sram_piece *pfree_head,
 }
 
 /* Allocate the largest available block.  */
-static void *_l1_sram_alloc_max(struct sram_piece *pfree_head,
+static void *_sram_alloc_max(struct sram_piece *pfree_head,
 				struct sram_piece *pused_head,
 				unsigned long *psize)
 {
@@ -259,11 +292,11 @@ static void *_l1_sram_alloc_max(struct sram_piece *pfree_head,
 
 	*psize = pmax->size;
 
-	return _l1_sram_alloc(*psize, pfree_head, pused_head);
+	return _sram_alloc(*psize, pfree_head, pused_head);
 }
 
-/* L1 memory free function */
-static int _l1_sram_free(const void *addr,
+/* SRAM free function */
+static int _sram_free(const void *addr,
 			struct sram_piece *pfree_head,
 			struct sram_piece *pused_head)
 {
@@ -334,6 +367,11 @@ int sram_free(const void *addr)
 		 && addr < (void *)(L1_DATA_B_START + L1_DATA_B_LENGTH))
 		return l1_data_B_sram_free(addr);
 #endif
+#ifdef L2_LENGTH
+	else if (addr >= (void *)L2_START
+		 && addr < (void *)(L2_START + L2_LENGTH))
+		return l2_sram_free(addr);
+#endif
 	else
 		return -1;
 }
@@ -348,7 +386,7 @@ void *l1_data_A_sram_alloc(size_t size)
 	spin_lock_irqsave(&l1_data_sram_lock, flags);
 
 #if L1_DATA_A_LENGTH != 0
-	addr = _l1_sram_alloc(size, &free_l1_data_A_sram_head,
+	addr = _sram_alloc(size, &free_l1_data_A_sram_head,
 			&used_l1_data_A_sram_head);
 #endif
 
@@ -371,7 +409,7 @@ int l1_data_A_sram_free(const void *addr)
 	spin_lock_irqsave(&l1_data_sram_lock, flags);
 
 #if L1_DATA_A_LENGTH != 0
-	ret = _l1_sram_free(addr, &free_l1_data_A_sram_head,
+	ret = _sram_free(addr, &free_l1_data_A_sram_head,
 			&used_l1_data_A_sram_head);
 #else
 	ret = -1;
@@ -393,7 +431,7 @@ void *l1_data_B_sram_alloc(size_t size)
 	/* add mutex operation */
 	spin_lock_irqsave(&l1_data_sram_lock, flags);
 
-	addr = _l1_sram_alloc(size, &free_l1_data_B_sram_head,
+	addr = _sram_alloc(size, &free_l1_data_B_sram_head,
 			&used_l1_data_B_sram_head);
 
 	/* add mutex operation */
@@ -418,7 +456,7 @@ int l1_data_B_sram_free(const void *addr)
 	/* add mutex operation */
 	spin_lock_irqsave(&l1_data_sram_lock, flags);
 
-	ret = _l1_sram_free(addr, &free_l1_data_B_sram_head,
+	ret = _sram_free(addr, &free_l1_data_B_sram_head,
 			&used_l1_data_B_sram_head);
 
 	/* add mutex operation */
@@ -472,7 +510,7 @@ void *l1_inst_sram_alloc(size_t size)
 	/* add mutex operation */
 	spin_lock_irqsave(&l1_inst_sram_lock, flags);
 
-	addr = _l1_sram_alloc(size, &free_l1_inst_sram_head,
+	addr = _sram_alloc(size, &free_l1_inst_sram_head,
 			&used_l1_inst_sram_head);
 
 	/* add mutex operation */
@@ -497,7 +535,7 @@ int l1_inst_sram_free(const void *addr)
 	/* add mutex operation */
 	spin_lock_irqsave(&l1_inst_sram_lock, flags);
 
-	ret = _l1_sram_free(addr, &free_l1_inst_sram_head,
+	ret = _sram_free(addr, &free_l1_inst_sram_head,
 			&used_l1_inst_sram_head);
 
 	/* add mutex operation */
@@ -519,7 +557,7 @@ void *l1sram_alloc(size_t size)
 	/* add mutex operation */
 	spin_lock_irqsave(&l1sram_lock, flags);
 
-	addr = _l1_sram_alloc(size, &free_l1_ssram_head,
+	addr = _sram_alloc(size, &free_l1_ssram_head,
 			&used_l1_ssram_head);
 
 	/* add mutex operation */
@@ -537,7 +575,7 @@ void *l1sram_alloc_max(size_t *psize)
 	/* add mutex operation */
 	spin_lock_irqsave(&l1sram_lock, flags);
 
-	addr = _l1_sram_alloc_max(&free_l1_ssram_head,
+	addr = _sram_alloc_max(&free_l1_ssram_head,
 			&used_l1_ssram_head, psize);
 
 	/* add mutex operation */
@@ -555,7 +593,7 @@ int l1sram_free(const void *addr)
 	/* add mutex operation */
 	spin_lock_irqsave(&l1sram_lock, flags);
 
-	ret = _l1_sram_free(addr, &free_l1_ssram_head,
+	ret = _sram_free(addr, &free_l1_ssram_head,
 			&used_l1_ssram_head);
 
 	/* add mutex operation */
@@ -564,6 +602,64 @@ int l1sram_free(const void *addr)
 	return ret;
 }
 
+void *l2_sram_alloc(size_t size)
+{
+#ifdef L2_LENGTH
+	unsigned flags;
+	void *addr;
+
+	/* add mutex operation */
+	spin_lock_irqsave(&l2_sram_lock, flags);
+
+	addr = _sram_alloc(size, &free_l2_sram_head,
+			&used_l2_sram_head);
+
+	/* add mutex operation */
+	spin_unlock_irqrestore(&l2_sram_lock, flags);
+
+	pr_debug("Allocated address in l2_sram_alloc is 0x%lx+0x%lx\n",
+		 (long unsigned int)addr, size);
+
+	return addr;
+#else
+	return NULL;
+#endif
+}
+EXPORT_SYMBOL(l2_sram_alloc);
+
+void *l2_sram_zalloc(size_t size)
+{
+	void *addr = l2_sram_alloc(size);
+
+	if (addr)
+		memset(addr, 0x00, size);
+
+	return addr;
+}
+EXPORT_SYMBOL(l2_sram_zalloc);
+
+int l2_sram_free(const void *addr)
+{
+#ifdef L2_LENGTH
+	unsigned flags;
+	int ret;
+
+	/* add mutex operation */
+	spin_lock_irqsave(&l2_sram_lock, flags);
+
+	ret = _sram_free(addr, &free_l2_sram_head,
+			&used_l2_sram_head);
+
+	/* add mutex operation */
+	spin_unlock_irqrestore(&l2_sram_lock, flags);
+
+	return ret;
+#else
+	return -1;
+#endif
+}
+EXPORT_SYMBOL(l2_sram_free);
+
 int sram_free_with_lsl(const void *addr)
 {
 	struct sram_list_struct *lsl, **tmp;
@@ -602,6 +698,9 @@ void *sram_alloc_with_lsl(size_t size, unsigned long flags)
 	if (addr == NULL && (flags & L1_DATA_B_SRAM))
 		addr = l1_data_B_sram_alloc(size);
 
+	if (addr == NULL && (flags & L2_SRAM))
+		addr = l2_sram_alloc(size);
+
 	if (addr == NULL) {
 		kfree(lsl);
 		return NULL;
@@ -621,7 +720,7 @@ EXPORT_SYMBOL(sram_alloc_with_lsl);
 /* Need to keep line of output the same.  Currently, that is 44 bytes
  * (including newline).
  */
-static int _l1sram_proc_read(char *buf, int *len, int count, const char *desc,
+static int _sram_proc_read(char *buf, int *len, int count, const char *desc,
 		struct sram_piece *pfree_head,
 		struct sram_piece *pused_head)
 {
@@ -630,13 +729,13 @@ static int _l1sram_proc_read(char *buf, int *len, int count, const char *desc,
 	if (!pfree_head || !pused_head)
 		return -1;
 
-	*len += sprintf(&buf[*len], "--- L1 %-14s Size   PID State     \n", desc);
+	*len += sprintf(&buf[*len], "--- SRAM %-14s Size   PID State     \n", desc);
 
 	/* search the relevant memory slot */
 	pslot = pused_head->next;
 
 	while (pslot != NULL) {
-		*len += sprintf(&buf[*len], "%p-%p %8i %5i %-10s\n",
+		*len += sprintf(&buf[*len], "%p-%p %10i %5i %-10s\n",
 			pslot->paddr, pslot->paddr + pslot->size,
 			pslot->size, pslot->pid, "ALLOCATED");
 
@@ -646,7 +745,7 @@ static int _l1sram_proc_read(char *buf, int *len, int count, const char *desc,
 	pslot = pfree_head->next;
 
 	while (pslot != NULL) {
-		*len += sprintf(&buf[*len], "%p-%p %8i %5i %-10s\n",
+		*len += sprintf(&buf[*len], "%p-%p %10i %5i %-10s\n",
 			pslot->paddr, pslot->paddr + pslot->size,
 			pslot->size, pslot->pid, "FREE");
 
@@ -655,38 +754,43 @@ static int _l1sram_proc_read(char *buf, int *len, int count, const char *desc,
 
 	return 0;
 }
-static int l1sram_proc_read(char *buf, char **start, off_t offset, int count,
+static int sram_proc_read(char *buf, char **start, off_t offset, int count,
 		int *eof, void *data)
 {
 	int len = 0;
 
-	if (_l1sram_proc_read(buf, &len, count, "Scratchpad",
+	if (_sram_proc_read(buf, &len, count, "Scratchpad",
 			&free_l1_ssram_head, &used_l1_ssram_head))
 		goto not_done;
 #if L1_DATA_A_LENGTH != 0
-	if (_l1sram_proc_read(buf, &len, count, "Data A",
+	if (_sram_proc_read(buf, &len, count, "L1 Data A",
 			&free_l1_data_A_sram_head,
 			&used_l1_data_A_sram_head))
 		goto not_done;
 #endif
 #if L1_DATA_B_LENGTH != 0
-	if (_l1sram_proc_read(buf, &len, count, "Data B",
+	if (_sram_proc_read(buf, &len, count, "L1 Data B",
 			&free_l1_data_B_sram_head,
 			&used_l1_data_B_sram_head))
 		goto not_done;
 #endif
 #if L1_CODE_LENGTH != 0
-	if (_l1sram_proc_read(buf, &len, count, "Instruction",
+	if (_sram_proc_read(buf, &len, count, "L1 Instruction",
 			&free_l1_inst_sram_head, &used_l1_inst_sram_head))
 		goto not_done;
 #endif
+#ifdef L2_LENGTH
+	if (_sram_proc_read(buf, &len, count, "L2",
+			&free_l2_sram_head, &used_l2_sram_head))
+		goto not_done;
+#endif
 
 	*eof = 1;
  not_done:
 	return len;
 }
 
-static int __init l1sram_proc_init(void)
+static int __init sram_proc_init(void)
 {
 	struct proc_dir_entry *ptr;
 	ptr = create_proc_entry("sram", S_IFREG | S_IRUGO, NULL);
@@ -695,8 +799,8 @@ static int __init l1sram_proc_init(void)
 		return -1;
 	}
 	ptr->owner = THIS_MODULE;
-	ptr->read_proc = l1sram_proc_read;
+	ptr->read_proc = sram_proc_read;
 	return 0;
 }
-late_initcall(l1sram_proc_init);
+late_initcall(sram_proc_init);
 #endif