indentation

1 files changed, 267 insertions, 267 deletions

diff --git a/kc/core/vm_tree.c b/kc/core/vm_tree.c
index dd3667e..9bab154 100644
--- a/kc/core/vm_tree.c
+++ b/kc/core/vm_tree.c
@@ -44,92 +44,92 @@
 
 static int compare(uintptr_t a1, size_t s1, uintptr_t a2, size_t s2)
 {
-    // case 1: a1:a1+s1 occupies a region entirely below a2
-    // and is therefore less than.
-    if ((a1 + s1) <= a2)
-    {
-        return -1;
-    }
-    // case 2: a1:a1+s1 occupies a region entirely above (a2+s2)
-    // and is therefore greater than.
-    else if (a1 >= (a2 + s2))
-    {
-        return 1;
-    }
-    // case 3: the above conditions are not satisfied and therefore
-    // the regions overlap and are considered equivalent.
-    return 0;
+	// case 1: a1:a1+s1 occupies a region entirely below a2
+	// and is therefore less than.
+	if ((a1 + s1) <= a2)
+	{
+		return -1;
+	}
+	// case 2: a1:a1+s1 occupies a region entirely above (a2+s2)
+	// and is therefore greater than.
+	else if (a1 >= (a2 + s2))
+	{
+		return 1;
+	}
+	// case 3: the above conditions are not satisfied and therefore
+	// the regions overlap and are considered equivalent.
+	return 0;
 }
 
 static int compare_key(struct vm_tree_key const * const k1,
-        struct vm_tree_key const * const k2)
+		struct vm_tree_key const * const k2)
 {
-    return compare(k1->address, k1->size, k2->address, k2->size);
+	return compare(k1->address, k1->size, k2->address, k2->size);
 }
 
 void vmt_init_node(
-        struct vm_tree *tree,
-        struct vm_tree_node *node,
-        struct vm_object *object,
-        void *base,
-        void *head)
+		struct vm_tree *tree,
+		struct vm_tree_node *node,
+		struct vm_object *object,
+		void *base,
+		void *head)
 {
-    memset(node, 0, sizeof(*node));
-    node->key =
-        (struct vm_tree_key)
-        {
-            (uintptr_t)base,
-            (uintptr_t)head - (uintptr_t)base
-        };
+	memset(node, 0, sizeof(*node));
+	node->key =
+		(struct vm_tree_key)
+		{
+			(uintptr_t)base,
+			(uintptr_t)head - (uintptr_t)base
+		};
 
-    struct vm_tree_node *ek = NULL;
-    if (!(ek = vmt_search_key(tree, &node->key)))
-    {
-        struct vm_tree_node *p = vmn_predecessor_key(
-                tree->root,
-                &node->key);
-        if (!p)
-        {
-            // the tree root should be in place of a missing predecessor
-            p = tree->root;
-        }
-        vmt_insert(
-                tree,
-                node,
-                p,
-                vmn_child_direction(node, p));
-        node->object = object;
-    }
-    else
-    {
-        kprintf("fatal: attempt to insert overlapping vm node\n"
-                "node 1: %p: %p @ %zu bytes\n"
-                "node 2: %p: %p @ %zu bytes\n",
-                node->key.address, node->key.size,
-                ek->key.address, ek->key.size);
-                
-        PANIC(GENERAL_PANIC);
-    }
+	struct vm_tree_node *ek = NULL;
+	if (!(ek = vmt_search_key(tree, &node->key)))
+	{
+		struct vm_tree_node *p = vmn_predecessor_key(
+				tree->root,
+				&node->key);
+		if (!p)
+		{
+			// the tree root should be in place of a missing predecessor
+			p = tree->root;
+		}
+		vmt_insert(
+				tree,
+				node,
+				p,
+				vmn_child_direction(node, p));
+		node->object = object;
+	}
+	else
+	{
+		kprintf("fatal: attempt to insert overlapping vm node\n"
+				"node 1: %p: %p @ %zu bytes\n"
+				"node 2: %p: %p @ %zu bytes\n",
+				node->key.address, node->key.size,
+				ek->key.address, ek->key.size);
+
+		PANIC(GENERAL_PANIC);
+	}
 
 }
 
 static struct vm_tree_node* RotateDirRoot(
-        struct vm_tree* T,   // red–black tree
-        struct vm_tree_node* P,   // root of subtree (may be the root of T)
-        enum vm_tree_direction dir) {   // dir ∈ { LEFT, RIGHT }
-    struct vm_tree_node* G = P->parent;
-    struct vm_tree_node* S = P->child[1-dir];
-    struct vm_tree_node* C;
-    assert(S != NIL); // pointer to true node required
-    C = S->child[dir];
-    P->child[1-dir] = C; if (C != NIL) C->parent = P;
-    S->child[  dir] = P; P->parent = S;
-    S->parent = G;
-    if (G != NULL)
-        G->child[ P == G->right ? RIGHT : LEFT ] = S;
-    else
-        T->root = S;
-    return S; // new root of subtree
+		struct vm_tree* T,   // red–black tree
+		struct vm_tree_node* P,   // root of subtree (may be the root of T)
+		enum vm_tree_direction dir) {   // dir ∈ { LEFT, RIGHT }
+	struct vm_tree_node* G = P->parent;
+	struct vm_tree_node* S = P->child[1-dir];
+	struct vm_tree_node* C;
+	assert(S != NIL); // pointer to true node required
+	C = S->child[dir];
+	P->child[1-dir] = C; if (C != NIL) C->parent = P;
+	S->child[  dir] = P; P->parent = S;
+	S->parent = G;
+	if (G != NULL)
+		G->child[ P == G->right ? RIGHT : LEFT ] = S;
+	else
+		T->root = S;
+	return S; // new root of subtree
 }
 
 #define RotateDir(N,dir) RotateDirRoot(T,N,dir)
@@ -137,251 +137,251 @@ static struct vm_tree_node* RotateDirRoot(
 #define RotateRight(N)   RotateDirRoot(T,N,RIGHT)
 
 void vmt_insert(
-        struct vm_tree* T,         // -> red–black tree
-        struct vm_tree_node* N,  // -> node to be inserted
-        struct vm_tree_node* P,  // -> parent node of N ( may be NULL )
-        enum vm_tree_direction dir) // side ( LEFT or RIGHT ) of P where to insert N
+		struct vm_tree* T,         // -> red–black tree
+		struct vm_tree_node* N,  // -> node to be inserted
+		struct vm_tree_node* P,  // -> parent node of N ( may be NULL )
+		enum vm_tree_direction dir) // side ( LEFT or RIGHT ) of P where to insert N
 {
-    struct vm_tree_node* G;  // -> parent node of P
-    struct vm_tree_node* U;  // -> uncle of N
+	struct vm_tree_node* G;  // -> parent node of P
+	struct vm_tree_node* U;  // -> uncle of N
 
-    N->color = RED;
-    N->left  = NIL;
-    N->right = NIL;
-    N->parent = P;
-    if (P == NULL) {   // There is no parent
-        T->root = N;     // N is the new root of the tree T.
-        return; // insertion complete
-    }
-    P->child[dir] = N; // insert N as dir-child of P
-    // start of the (do while)-loop:
-    do {
-        if (P->color == BLACK) {
-            // Case_I1 (P black):
-            return; // insertion complete
-        }
-        // From now on P is red.
-        if ((G = P->parent) == NULL) 
-            goto Case_I4; // P red and root
-        // else: P red and G!=NULL.
-        dir = childDir(P); // the side of parent G on which node P is located
-        U = G->child[1-dir]; // uncle
-        if (U == NIL || U->color == BLACK) // considered black
-            goto Case_I56; // P red && U black
-        // Case_I2 (P+U red):
-        P->color = BLACK;
-        U->color = BLACK;
-        G->color = RED;
-        N = G; // new current node
-        // iterate 1 black level higher
-        //   (= 2 tree levels)
-    } while ((P = N->parent) != NULL);
-    // end of the (do while)-loop
-    // Leaving the (do while)-loop (after having fallen through from Case_I2).
-    // Case_I3: N is the root and red.
-    return; // insertion complete
+	N->color = RED;
+	N->left  = NIL;
+	N->right = NIL;
+	N->parent = P;
+	if (P == NULL) {   // There is no parent
+		T->root = N;     // N is the new root of the tree T.
+		return; // insertion complete
+	}
+	P->child[dir] = N; // insert N as dir-child of P
+					   // start of the (do while)-loop:
+	do {
+		if (P->color == BLACK) {
+			// Case_I1 (P black):
+			return; // insertion complete
+		}
+		// From now on P is red.
+		if ((G = P->parent) == NULL) 
+			goto Case_I4; // P red and root
+						  // else: P red and G!=NULL.
+		dir = childDir(P); // the side of parent G on which node P is located
+		U = G->child[1-dir]; // uncle
+		if (U == NIL || U->color == BLACK) // considered black
+			goto Case_I56; // P red && U black
+						   // Case_I2 (P+U red):
+		P->color = BLACK;
+		U->color = BLACK;
+		G->color = RED;
+		N = G; // new current node
+			   // iterate 1 black level higher
+			   //   (= 2 tree levels)
+	} while ((P = N->parent) != NULL);
+	// end of the (do while)-loop
+	// Leaving the (do while)-loop (after having fallen through from Case_I2).
+	// Case_I3: N is the root and red.
+	return; // insertion complete
 Case_I4: // P is the root and red:
-    P->color = BLACK;
-    return; // insertion complete
+	P->color = BLACK;
+	return; // insertion complete
 Case_I56: // P red && U black:
-    if (N == P->child[1-dir])
-    { // Case_I5 (P red && U black && N inner grandchild of G):
-        RotateDir(P,dir); // P is never the root
-        N = P; // new current node
-        P = G->child[dir]; // new parent of N
-        // fall through to Case_I6
-    }
-    // Case_I6 (P red && U black && N outer grandchild of G):
-    RotateDirRoot(T,G,1-dir); // G may be the root
-    P->color = BLACK;
-    G->color = RED;
-    return; // insertion complete
+	if (N == P->child[1-dir])
+	{ // Case_I5 (P red && U black && N inner grandchild of G):
+		RotateDir(P,dir); // P is never the root
+		N = P; // new current node
+		P = G->child[dir]; // new parent of N
+						   // fall through to Case_I6
+	}
+	// Case_I6 (P red && U black && N outer grandchild of G):
+	RotateDirRoot(T,G,1-dir); // G may be the root
+	P->color = BLACK;
+	G->color = RED;
+	return; // insertion complete
 } // end of RBinsert1
 
 void vmt_delete(
-        struct vm_tree* T, // -> red–black tree
-        struct vm_tree_node* N)  // -> node to be deleted
+		struct vm_tree* T, // -> red–black tree
+		struct vm_tree_node* N)  // -> node to be deleted
 {
-    struct vm_tree_node* P = N->parent;  // -> parent node of N
-    enum vm_tree_direction dir; // side of P on which N is located (∈ { LEFT, RIGHT })
-    struct vm_tree_node* S;  // -> sibling of N
-    struct vm_tree_node* C;  // -> close   nephew
-    struct vm_tree_node* D;  // -> distant nephew
+	struct vm_tree_node* P = N->parent;  // -> parent node of N
+	enum vm_tree_direction dir; // side of P on which N is located (∈ { LEFT, RIGHT })
+	struct vm_tree_node* S;  // -> sibling of N
+	struct vm_tree_node* C;  // -> close   nephew
+	struct vm_tree_node* D;  // -> distant nephew
 
-    // P != NULL, since N is not the root.
-    dir = childDir(N); // side of parent P on which the node N is located
-    // Replace N at its parent P by NIL:
-    P->child[dir] = NIL;
-    goto Start_D;      // jump into the loop
+	// P != NULL, since N is not the root.
+	dir = childDir(N); // side of parent P on which the node N is located
+					   // Replace N at its parent P by NIL:
+	P->child[dir] = NIL;
+	goto Start_D;      // jump into the loop
 
-    // start of the (do while)-loop:
-    do {
-        dir = childDir(N);   // side of parent P on which node N is located
+	// start of the (do while)-loop:
+	do {
+		dir = childDir(N);   // side of parent P on which node N is located
 Start_D:
-        S = P->child[1-dir]; // sibling of N (has black height >= 1)
-        D = S->child[1-dir]; // distant nephew
-        C = S->child[  dir]; // close   nephew
-        if (S->color == RED)
-            goto Case_D3;                  // S red ===> P+C+D black
-        // S is black:
-        if (D != NIL && D->color == RED) // not considered black
-            goto Case_D6;                  // D red && S black
-        if (C != NIL && C->color == RED) // not considered black
-            goto Case_D5;                  // C red && S+D black
-        // Here both nephews are == NIL (first iteration) or black (later).
-        if (P->color == RED)
-            goto Case_D4;                  // P red && C+S+D black
-        // Case_D1 (P+C+S+D black):
-        S->color = RED;
-        N = P; // new current node (maybe the root)
-        // iterate 1 black level
-        //   (= 1 tree level) higher
-    } while ((P = N->parent) != NULL);
-    // end of the (do while)-loop
-    // Case_D2 (P == NULL):
-    return; // deletion complete
+		S = P->child[1-dir]; // sibling of N (has black height >= 1)
+		D = S->child[1-dir]; // distant nephew
+		C = S->child[  dir]; // close   nephew
+		if (S->color == RED)
+			goto Case_D3;                  // S red ===> P+C+D black
+										   // S is black:
+		if (D != NIL && D->color == RED) // not considered black
+			goto Case_D6;                  // D red && S black
+		if (C != NIL && C->color == RED) // not considered black
+			goto Case_D5;                  // C red && S+D black
+										   // Here both nephews are == NIL (first iteration) or black (later).
+		if (P->color == RED)
+			goto Case_D4;                  // P red && C+S+D black
+										   // Case_D1 (P+C+S+D black):
+		S->color = RED;
+		N = P; // new current node (maybe the root)
+			   // iterate 1 black level
+			   //   (= 1 tree level) higher
+	} while ((P = N->parent) != NULL);
+	// end of the (do while)-loop
+	// Case_D2 (P == NULL):
+	return; // deletion complete
 Case_D3: // S red && P+C+D black:
-    RotateDirRoot(T,P,dir); // P may be the root
-    P->color = RED;
-    S->color = BLACK;
-    S = C; // != NIL
-    // now: P red && S black
-    D = S->child[1-dir]; // distant nephew
-    if (D != NIL && D->color == RED)
-        goto Case_D6;      // D red && S black
-    C = S->child[  dir]; // close   nephew
-    if (C != NIL && C->color == RED)
-        goto Case_D5;      // C red && S+D black
-    // Otherwise C+D considered black.
-    // fall through to Case_D4
-    // Case_D4: // P red && S+C+D black:
-    S->color = RED;
-    P->color = BLACK;
-    return; // deletion complete
+	RotateDirRoot(T,P,dir); // P may be the root
+	P->color = RED;
+	S->color = BLACK;
+	S = C; // != NIL
+		   // now: P red && S black
+	D = S->child[1-dir]; // distant nephew
+	if (D != NIL && D->color == RED)
+		goto Case_D6;      // D red && S black
+	C = S->child[  dir]; // close   nephew
+	if (C != NIL && C->color == RED)
+		goto Case_D5;      // C red && S+D black
+						   // Otherwise C+D considered black.
+						   // fall through to Case_D4
+						   // Case_D4: // P red && S+C+D black:
+	S->color = RED;
+	P->color = BLACK;
+	return; // deletion complete
 Case_D4: // P red && S+C+D black:
-  S->color = RED;
-  P->color = BLACK;
-  return; // deletion complete
+	S->color = RED;
+	P->color = BLACK;
+	return; // deletion complete
 Case_D5: // C red && S+D black:
-    RotateDir(S,1-dir); // S is never the root
-    S->color = RED;
-    C->color = BLACK;
-    D = S;
-    S = C;
-    // now: D red && S black
-    // fall through to Case_D6
+	RotateDir(S,1-dir); // S is never the root
+	S->color = RED;
+	C->color = BLACK;
+	D = S;
+	S = C;
+	// now: D red && S black
+	// fall through to Case_D6
 Case_D6: // D red && S black:
-    RotateDirRoot(T,P,dir); // P may be the root
-    S->color = P->color;
-    P->color = BLACK;
-    D->color = BLACK;
-    return; // deletion complete
+	RotateDirRoot(T,P,dir); // P may be the root
+	S->color = P->color;
+	P->color = BLACK;
+	D->color = BLACK;
+	return; // deletion complete
 } // end of RBdelete2
 
 enum vm_tree_direction vmn_child_direction(
-        struct vm_tree_node *n,
-        struct vm_tree_node *p
-)
+		struct vm_tree_node *n,
+		struct vm_tree_node *p
+		)
 {
-    if (p && (compare_key(&p->key, &n->key) > 0))
-    {
-        return LEFT;
-    }
-    return RIGHT;
+	if (p && (compare_key(&p->key, &n->key) > 0))
+	{
+		return LEFT;
+	}
+	return RIGHT;
 }
 
 struct vm_tree_node *vmt_search_key(
-        struct vm_tree *tree,
-        struct vm_tree_key *key)
+		struct vm_tree *tree,
+		struct vm_tree_key *key)
 {
-    struct vm_tree_node *N = tree->root;
-    
-    while (N && (compare_key(&N->key, key) != 0))
-    {
-        if (compare_key(&N->key, key) > 0)
-        {
-            N = N->left;
-        }
-        else
-        {
-            N = N->right;
-        }
-    }
+	struct vm_tree_node *N = tree->root;
+
+	while (N && (compare_key(&N->key, key) != 0))
+	{
+		if (compare_key(&N->key, key) > 0)
+		{
+			N = N->left;
+		}
+		else
+		{
+			N = N->right;
+		}
+	}
 
-    return N;
+	return N;
 }
 
 // search for the predecessor node for a given key
 struct vm_tree_node *vmn_predecessor_key(
-        struct vm_tree_node *N,
-        struct vm_tree_key *key)
+		struct vm_tree_node *N,
+		struct vm_tree_key *key)
 {
-    struct vm_tree_node *P = NULL;
+	struct vm_tree_node *P = NULL;
 
-    while (N && (compare_key(&N->key, key) != 0))
-    {
-        if (compare_key(&N->key, key) > 0)
-        {
-            N = N->left;
-        }
-        else
-        {
-            P = N;
-            N = N->right;
-        }
-    }
+	while (N && (compare_key(&N->key, key) != 0))
+	{
+		if (compare_key(&N->key, key) > 0)
+		{
+			N = N->left;
+		}
+		else
+		{
+			P = N;
+			N = N->right;
+		}
+	}
 
-    return P;
+	return P;
 }
 
 // search for the successor node for a given key
 struct vm_tree_node *vmn_successor_node(
-        struct vm_tree_node *N)
+		struct vm_tree_node *N)
 {
-    if (N && N->right)
-    {
-        return vmn_min(N->right);
-    }
+	if (N && N->right)
+	{
+		return vmn_min(N->right);
+	}
 
-    struct vm_tree_node *p = N->parent;
-    while (p && N == p->right)
-    {
-        N = p;
-        p = p->parent;
-    }
+	struct vm_tree_node *p = N->parent;
+	while (p && N == p->right)
+	{
+		N = p;
+		p = p->parent;
+	}
 
-    return p;
+	return p;
 }
 
 struct vm_tree_node *vmn_min(struct vm_tree_node *node)
 {
-    while (node && node->left)
-    {
-        node = node->left;
-    }
+	while (node && node->left)
+	{
+		node = node->left;
+	}
 
-    return node;
+	return node;
 }
 
 struct vm_tree_node *vmn_max(struct vm_tree_node *node)
 {
-    while (node && node->right)
-    {
-        node = node->right;
-    }
+	while (node && node->right)
+	{
+		node = node->right;
+	}
 
-    return node;
+	return node;
 }
 
 struct vm_object *vmt_get_object(struct vm_tree *tree, void *address)
 {
-    // find the object for a page.
-    struct vm_tree_key key = {(uintptr_t)address, 1};
-    struct vm_tree_node *node = vmt_search_key(tree, &key);
-    if (node)
-    {
-        return node->object;
-    }
-    return NULL;
+	// find the object for a page.
+	struct vm_tree_key key = {(uintptr_t)address, 1};
+	struct vm_tree_node *node = vmt_search_key(tree, &key);
+	if (node)
+	{
+		return node->object;
+	}
+	return NULL;
 }